Composite Element Research Articles

Microstructural Characterization of Hot Shortness in Steels

Hot shortness in steels is a macro crack on the steel surface especially on the slab edges of hot rolled steels produced by recycling. Hot shortness in steels is characterized by intergranular cracking of steel on the surface during hot rolling process. The hot shortness damage can be seen by naked eye due to macro cracks on steel surface, after the hot rolling of slab. Although macro cracks can occur due to various parameters such as excessive force or deformed rolls, hot shortness is directly linked to residual elements in the steel composition. Most common and effective residual element for hot shortness is copper. Copper in steel originates from the used scrap in Electric Arc Furnace (EAF) steelmaking. Decreased primary sources and environmental concerns with increased scrap output in the world make the recycling of steel inevitable. Copper segregates in the austenite grain boundaries during the annealing of steel prior to hot rolling. Liquified copper film decreases the grain cohesion between austenite grains and results in intergranular cracking by the force applied during the rolling. Detection of copper in microstructure is vital to understand mechanism of hot shortness. Common knowledge in the literature of hot shortness suggests that hot shortness mechanism consists of oxidation-segregation-decreased grain cohesion-crack route. In this study, detailed microstructure images of steel surfaces are discussed with optical and scanning electron microscopy examinations. Examined samples of hot shortness are collected from scientific experiments and industrial practice examples. Helpful techniques and etching agents for copper revelation in microstructure are evaluated and explained in this paper.

Экспериментальные исследования адгезионного взаимодействия в зоне контакта стекла и алюминия в стеклометаллокомпозитном элементе

При создании стекло-металлических соединений, в том числе нового конструкционного материала стеклометаллокомпозита, используется способность стекла надежно соединяться с металлами при определенном уровне температур стекла и металла. Адгезия горячего стекла тесно связана с физико-химическими процессами, протекающими на границе раздела «стекло – металл». Соединение зависит от температуры металлических обшивок и расплава стекла, времени выдержки, давления, состава стекла и металла. В данной работе экспериментально исследуется влияние технологических параметров центробежного литья на прочностные свойства конструкционного элемента стеклометаллокомпозита, как результата контактного взаимодействия слоев, сила сцепления которых определяет основные механические свойства соединения. Предлагается экспериментальный метод определения адгезионной силы при исследовании конструктивных цилиндрических образцов стеклометаллокомпозита на сдвиг. When creating glass-metal compounds, including a new structural material of glassmetal composite, the ability of glass to reliably connect with metals at a certain temperature level of glass and metal is used. The adhesion of hot glass is closely related to the physico-chemical processes occurring at the glass–metal interface. The connection depends on the temperature of the metal sheaths and the melt of the glass, the holding time, the pressure, the composition of the glass and metal. In this paper, the influence of technological parameters of centrifugal casting on the strength properties of a structural element of a glass-metal composite is experimentally investigated as a result of the contact interaction of layers, the adhesion strength of which determines the basic mechanical properties of the compound. An experimental method for determining the adhesive force in the study of structural cylindrical samples of glass-metal composite for shear is proposed.

Intelligent Design and Application of Traditional Cultural and Creative Products Based on Digital Art Elements

Abstract Cultural and creative industry is one of the main fields of digital art element design, and this paper utilizes digital art design for visualization programming of cultural and creative works. Through the three elements of 3D model, registration method and animation composition, the intelligent design process of AR cultural and creative products is defined, and the editing process of AR cultural and creative products is sorted out on this basis. Construct the model of cultural and creative products containing digital art elements, solve the problem of inconsistency between the coordinates and the model network appearing in the modeling, and then carry out the back-end design processing for AR cultural and creative products editing, which constitutes the whole back-end module through real-time methods and multiple trigger events. Through the method of empirical analysis, the feasibility of adding digital art elements to cultural and creative products, the consumers’ willingness to purchase cultural and creative products, and the innovation performance of cultural and creative products are analyzed. In the test of the moderating effect of the intelligent design of digital art elements on the cultural and creative products, the performance of the cultural and creative products improves synchronously with the embedding of the digital art elements, and the mean value finally stays at 0.375, and all the straight lines are above zero.

Preparation of aluminum diethyl hypophosphite intercalation‐modified montmorillonite AlPi‐MMT and its effect on the flame retardancy and smoke suppression of thermoplastic polyester elastomer

AbstractAn aluminum diethyl hypophosphite intercalation‐modified montmorillonite flame retardant (AlPi‐MMT) is successfully prepared and characterized by FT‐IR, SEM, and X‐ray diffraction. It is found that thermoplastic polyester elastomer (TPEE) composites incorporating 15 wt% AlPi‐MMT flame retardant exhibited better char formation and flame retardant properties compared to those incorporating 15 wt% (4:1, w:w) AlPi and MMT. And the char residual of TPEE/AlPi‐MMT at 700°C is 16.17%, which is higher than that of TPEE/AlPi‐MMT at 13.94%. and the former can pass UL‐94 V‐0 rating test while the latter can only pass UL‐94 V‐1 rating test. Afterwards, the combustion performance of TPEE composites is characterized, and it is found that the heat release and smoke release of TPEE/AlPi‐MMT are greatly reduced compared with those of pure TPEE and TPEE/AlPi/MMT, which is a flame retardant and smoke suppressant TPEE composite. Finally, by analyzing the residual char morphology and elements of TPEE composites after combustion, the mechanism of the flame retardant AlPi‐MMT to promote char formation and flame retardancy is demonstrated.

Genomic Characterization of Escherichia coli Co-Producing KPC-2 and NDM-5 Carbapenemases Isolated from Intensive Care Unit in a Chinese Hospital.

Background: Around the world, carbapenemase-producing Escherichia coli is becoming more prevalent. The purpose of this research was to analyze the whole plasmid sequences from YL03 isolates of the E. coli strain that produce both KPC-2 and NDM-5 carbapenemases. Materials and Methods: Whole-genome sequencing (WGS) and analysis of E. coli strain YL03, which was isolated from a wound sample, was performed by Illumina Novaseq 6000 and Pacific Biosciences Sequel (PacBio, Menlo Park, CA) sequencers. Following that, the WGS results were used to predict and analyze the YL03 genome composition and function. A complete gene sequence for YL03 with the accession number CP093551 has been uploaded to GenBank. Results: The results showed that YL03 co-carried five resistance genes, which included blaKPC-2, blaNDM-5, blaTEM-1B, blaCTX-M-14, and mdf(A). Furthermore, three resistance plasmids were found in YL03: pYL03-KPC, pYL03-NDM, and pYL03-CTX. Among them, the 53 kb-long pYL03-KPC plasmid belonging to the IncP, carried the replicase gene (repA) and the carbapenemase gene (blaKPC-2). The blaKPC-2 gene was flanked by a composite transposon-like element (Tn3-[Tn3] tnpR-ISKpn27 blaKPC--ISKpn6). Conclusions: The YL03 strain co-carried blaKPC-2 and blaNDM-5 and had a unique multidrug resistance plasmid containing blaKPC-2.

Thermodynamic properties of refractory Mo-Nb-V-Ti high entropy alloys (HEAs)

High entropy alloys (HEAs) are solid solution alloys containing at least 5 elements in equiatomic or near-equiatomic composition. In the present study we report on an alloy design route for refractory HEAs based on Mo-Nb-V-xTi alloys (x denotes mole per cent of Ti, x = 5, 10, 15, 20, 25, the mole per cents of Mo, Nb, and V are equal). The thermodynamic activities of Ti and V were determined by Knudsen effusion mass spectrometry and the measured data were compared to the calculated data obtained by CALPHAD method.

(Invited) A Dive into the Complex Mechanisms That May or May Not Increase Li/Na Mobility in Solid State Conductors

The conductivity of Li and Na has achieved remarkably high values in some materials, higher than what has been achieved in liquid electrolytes. Because there is no mobile solvation shell in solid-state conductors, the maximum of conductivity is essentially unlimited. I will discuss our current understanding of the compositional and structural elements that contribute to very high alkali ion mobility. This will include a discussion, of activated complexes that create concerted motion, possible high-entropy effects, the effect of (poly)anions, and structural topology.

Composition Elements of the Traditional Joget Utan Dance in Bunjung Village Siak Regency

This research aims to examine the elements of dance composition in the Joget Utan traditional dance in Bunsur Village, Sungai Apit District, Siak Regency. The Joget Utan dance is rich in cultural values and is a legacy from previous generations. The traditional Joget Utan dance is an integral part of the life of the local community. However, there has been no research that has studied in depth the elements of this dance composition. Therefore, this research aims to fill this gap and provide a deeper understanding of the elements involved in the Joget Utan dance. The research method uses a qualitative approach with data collection methods through direct observation of dance performances, interviews with dancers and local community leaders, as well as literature study to obtain information on the Joget Utan dance. The collected data will be analyzed descriptively to describe the elements of dance composition. By following this stage, it is hoped that we can provide better insight into the richness of Joget Utan dance culture and contribute to efforts to preserve and develop this traditional dance art

Comparative analysis of the dynamic characteristics of all-metal, composite and composite blades with the same profile, taking into account the influence of the connection of elements and aerodynamic loads

The paper presents a comparative analysis of the dynamic properties of the blades of one rotary machine which have the same airfoil shape, but are made of three different materials, namely aluminum alloy, a complex material combining aluminum alloy and steel, and a composite material which is unidirectional fiberglass. In the case of an all-metal blade, its airfoil and root are made of aluminum alloy. In the case of complex blade airfoil material, the root is made of steel which is also a component of the airfoil material. In the case of a composite blade, the root is steel and is connected at the root section to its composite airfoil. The main attention when comparing models of the mechanical behavior of three types of blades is paid to the influence of the connection of complex and composite elements with the root on the dynamic characteristics of the blade as a whole which is achieved by considering the contact interactions of the elements under the action of centrifugal and aerodynamic loads and the subsequent transfer of the prestressed state of the blades to the modal analysis for determination of the dynamic characteristics of samples and their comparison. In order to correctly display the fixation of elements in the fan impeller in the case of an aluminum blade, the sector of cyclic symmetry of the rotor is considered which makes it possible to draw a conclusion about the possibility of further separate consideration of the blade for determination of its dynamic characteristics due to the much greater stiffness of the connection of the blade with the impeller in comparison with stiffness of the blade airfoil, and to generalize this conclusion in the case of a complex blade by considering a steel root with an aluminum profile with rigid clamping of the model on the contact shelves of the root, and in the case of a composite blade by considering an airfoil with rigid clamping in the root section, where the fastening to the steel root of the blade takes place. The results of a comparative analysis of the dynamic behavior of three types of blades with the same airfoil shape are presented in the form of a study of the blade natural frequencies and mode shapes.

The Relationship between Body Composition and Physical Activity Level in Students of Medical Faculties.

Maintaining an active lifestyle is crucial for good health. Markers of health risk include tissue components. This study aimed to indicate which body composition elements create the strongest correlations with physical activity performed in young students of medical faculties. The study group consisted of 75 students (33 men and 42 women) from Wroclaw Medical University. Each student underwent accelerometer and anthropometric measurements and body composition analysis. Both men and women had similar physical activity levels. The study found that the amount of vigorous physical activity correlated significantly with the basal metabolic rate (BMR), fat, water and muscle content, fat-free mass (FFM), bone mass, extracellular to intracellular water ratio (ECW/ICW), and phase angle (PA), with r~ ± (0.2-0.4). The amount of moderate physical activity correlated with body mass, body mass index (BMI), BMR, FFM, and bone mass, with r~0.3-0.5. There are dimorphic differences in the strength of correlations between physical activity and elements of body composition. A greater amount of moderate and vigorous physical activity is associated with greater FFM and bone mass in men, which causes BMI to increase as well (in this case, higher BMI is not a sign of being overweight). For women, the beneficial effect of higher amounts of vigorous physical activity on reducing fat content and increasing muscle mass is more pronounced. In both men and women, an improvement in hydration is evident with increased vigorous physical activity volume.

Theological Programme, Analogies, Innovations in Mural Painting of the Exaltation of the Precious Cross Church of the Kyiv-Pechersk Lavra in 1894

The purpose of the article is to investigate the theological programme, continuity and originality of the mural paintings of the Exaltation of the Precious Cross Church of the Kyiv-Pechersk Lavra in 1894. The research methodology is based on historical and cultural analysis, as well as art historical analysis. The scientific novelty of the study. The theological programme of the mural painting of the Cross Exaltation Church of the Kyiv-Pechersk Lavra in 1894 has been studied: its genesis, ideological basis, main theme, thematic plot lines, and thematic hierarchy have been determined. The continuity principle is defined as the basis of the connection between the original (the 18th century) and renewed (1894; Daniil Davydov) decoration of the Cross Exaltation Church. The pictorial compositions analogies to the paintings of the compartments of Lavra Great Church (Dormition Cathedral) according to the programme of the 1720s are observed. Secondary analogies with some compositions in the Lavra Trinity Gate Church are also indicated. Along with analogies, the differences in the thematic, compositional, and stylistic interpretation of the paintings have been investigated. The academicism features in the mural painting of 1894 have been analysed. The originality of themes and plots addition in the mural paintings with icons in the iconostasis and the altar has been revealed. Conclusions. The mural painting programme’s primary source of the Cross Exaltation Church of the Kyiv Pechersk Lavra has been the programme of painting the interior of Lavra Great Church (Dormition Cathedral) in the 1720s. The renewed mural paintings of 1894 inherited the original decoration of the Cross Exaltation Church. Analogies with the paintings of the Great Church can be traced to the theme and general compositional schemes. A partial analogy to the mural painting of the Trinity Church narthex has been used as a component for another theme. Innovations in the paintings of the Cross Exaltation Church have been manifested in the formation of a peculiar thematic hierarchy, a change in compositional elements, and a transition from the baroque style to the traditions of academic sacred painting. The originality is manifested in the presentation of emotionally saturated subjects in the altar icons and paintings, due to which a calm and sublime rhythm of the wall compositions are created. Some icons are a plot addition to the murals. Several thematic lines are revealed in the mural painting, namely the sacrifice of the Saviour on the cross, the sacrifice of a man to God, the meeting of a man with God, the Divine Liturgy and Church of Christ. The main theme of the church painting decoration is the glorification of Christ’s atoning sacrifice and the Precious and Life-giving Cross of the Lord as the instrument of His victory and our salvation. The ideological basis of the mural paintings theological programme is a line from the Epistle of the Apostle Paul to the Hebrews [Hebrews 19:39–40, 20:1–2]. Keywords: sacral culture, Orthodoxy, academic painting, baroque painting, mural painting, sacral painting, Ukrainian painting, Great Church, Dormition Cathedral, Cross Exaltation Church, Holy Trinity Gate Church, Daniil Davydov.

Finite element dynamic modeling and vibration reduction analysis of the double-lap bolted thin plate with partially attached constrained layer damping

The double-lap bolted thin plate is widely used, but it is easy to produce vibration. In this paper, the method of attaching H-shaped constrained layer damping (CLD) is adopted to reduce vibration, and the finite element dynamic model of the double-lap bolted thin plate with H-shaped CLD is investigated. The innovations of the modeling method are described as follows. A composite element with four nodes and 28 degrees of freedom (DOFs) is produced by taking into account the interlaminar shear deformation of the CLD structure and employing complex modulus to quantify the damping characteristics of the viscoelastic layer. A series of transition elements are constructed to conduct the assembly of elements with inconsistent dimensions. Complex stiffness spring components and mass elements are presented to simulate the stiffness, damping, and mass characteristics of the double-lap bolt joint based on the crock-shaped stress distribution in the double-lap bolt joint and taking the bolt effect region into account. Finally, a case study is carried out, and the rationality of the finite element model of the bolted structure in solving the natural characteristics and vibration response parameters is verified by the established experimental tests. At the same time, the test and modeling results show that the H-shaped CLD reduces vibration on the double-lap bolted thin plate. Furthermore, based on the established finite element model, the influence of the attaching position of the H-shaped CLD, thicknesses of the viscoelastic layer, and the constraining layer on the vibration characteristics of the bolted structure are analyzed.

Tribological properties of DLC and GLC coating for automotive engine components application under lubrication

Modern automotive designs are needed to increase mechanical and thermal loads that have longer lifespans and are lighter. The power transmissions and motors often use low-friction hard coatings to prevent wear and reduce friction. The Cr-doped graphite-like carbon method is employed for evaluating coating friction and responses to chromium-doped graphite-like carbon (Cr-GLC) under lubrication. Cr-GLC coatings and chromium-doped diamond-like carbon (Cr-DLC) coatings are arranged using physical vapor deposition (PVD) and plasma-enhanced chemical vapor deposition (PECVD), respectively. The results have demonstrated in comparison to the dry friction coefficient, the friction coefficient under lubrication conditions has been reduced by 40%. Due to its excellent frictional physicochemical properties and compact microstructure, Cr-DLC has an optimum tribological resistance that is significantly higher than that of Cr-GLC. Viscosity, corrosivity, and coating microstructure are used to measure the impact of composite elements. The most ideal characteristics of the Cr-GLC coating are attributed to the non-reaction of additives in oil with friction surfaces.

Queer Affects in the Wandering Films of Antonio Hens

This article proposes an analysis of queer affects as they manifest in the films Clandestinos (2007) and La partida (2013), directed by the Spanish filmmaker Antonio Hens. Our exploration situates these films within a complex transnational framework, a context that not only shapes Hens’s authorial poetics, driven by the imperatives of production within his own film company but also exerts a profound influence on the subjectivity of the queer adolescent characters, a distinctive recurring compositional element throughout Hens’s oeuvre. Both films abound with thematic elements revolving around nomadic subjective experiences, encompassing themes of displacement, deterritorialization, spatial disjunctions, national estrangement, and an enduring yearning for alternative geographical contexts. Hens’s cinematic techniques amplify a pronounced sense of wandering nomadism and queer itinerancy. Within the scope of this article, we embark on an exploration of nuanced representations of queer subjects and their intimate or romantic relationships in various geographic settings. This analysis employs critical paradigms linked to the concepts of homonationalism, queer migration, and emotional intelligibility. Hens’s ‘wandering films’ adroitly utilize male characters who traverse intricate geographic landscapes. These are youthful and sexually fluid figures navigating a complex web of intimate and public urban spaces consistently tethered to notions of national identity. Consequently, these films identify the convergence of corporeal experiences and geographic environments as the locus where ineffable queer affective experiences manifest.

The armoured cuticle of the black soldier fly Hermetia illucens

We characterise in detail the larval and pupal cuticle of the black soldier fly Hermetia illucens L. (Diptera: Stratiomyidae), a key insect species in circular economy. In particular, we focus on ultrastructure using scanning and transmission electron microscopy, material characterization and composition (elements and minerals) with confocal laser scanning microscope, energy dispersive X-ray microanalysis, powder X-ray diffraction and mechanical properties with nanoindentation measurements. Calcium carbonate crystallizes on the epicuticle as blocks of calcite in the pupal cuticle. Calcium carbonate granules are stored in two specialised Malpighian tubules. CaCO3 is already present in the cuticle of young larval instars, but it is mainly in the form of amorphous calcium carbonate while the amount of calcite increases during larval development. The presence of calcite leads to cuticle hardening. Larval and pupal cuticles contain large amounts of resilin which guarantee cuticle flexibility.

Effective width of steel-concrete composite box girder bridges: a review and method comparison

Steel-concrete composite girders have non-uniform stress distribution on the slab, presenting maximum stresses next to the webs of the girder. This phenomenon is known as shear lag effect. To understand this effect, there is the effective width concept, in which only a portion of the slab width is considered effective in contributing to the composite element’s resistant capacity. However, in the technical standards, there is no recommendation for calculating the effective width in steel-concrete composite box girder bridges. In view of this situation, the purpose of this paper is to carry out a systematic review on effective width and/or the shear lag effect in steel-concrete composite bridges, in order to raise the main existing recommendations and compare them. Through a bibliometric scan with carefully chosen keywords, it was found that of all research on shear lag or effective width in steel-concrete composite structures, only 31.19 are on bridges and 14.97% are on bridges with box girders. Among the papers, those that have a method for calculating the effective width of steel-concrete composite girder bridges have been compared quantitatively and qualitatively with the procedures of AASHTO and EN 1994-2-2. In these procedures were also identified that the, for the boundary conditions of the present paper, the parameters that most influencing the effective width are, in that order, the span length, the distance between girders, the concrete slab height, the longitudinal position and the type of load.

Напрями розвитку методології регулювання хімічного складу і властивостей чавуну в ливарному виробництві на базі ймовірнісного підходу

From the standpoint of systemic and structural-functional approaches, the state and prospects of development of the methodology for regulating and predicting the chemical composition and mechanical properties of grey synthetic cast iron intended for casting production are analysed. Attention is focused on the key intersections of the technological process of manufacturing castings for critical applications. The features, disadvantages, and advantages of the known methods for calculating the charge and adjusting the percentage of chemical elements in the cast iron composition directly during its melting are considered. Ways to take into account the instability of the chemical composition of scrap metal, ferroalloys, and other materials when forming the charge to ensure the quality of pig iron in accordance with the requirements of finished product standards are shown. A promising way to solve this problem in foundry is to use a probabilistic approach and the Monte Carlo method. The article presents formulas for calculating the strength and hardness of cast iron castings with lamellar graphite depending on its carbon equivalent and degree of eutecticity. The peculiarity of the proposed formulas, which gives them enhanced reliability and validity, is that the carbon equivalent and the degree of eutecticity of cast iron in them are determined by the Monte Carlo method using a probabilistic approach with regard to the consideration of the ranges of variation of the content of chemical elements in the cast iron composition regulated in the standard for foundry products. It is noted that the widespread use of thermal derivative express analysis of liquid cast iron in industry is constrained by the lack of a database of reference cooling curves with certain property indicators (chemical composition, microstructure, mechanical and other properties) of cast irons at foundries. Keywords: foundry, cast iron, chemical composition, properties, control, regulation, methodology.

Geochemical Characteristics of the Middle Jurassic Coal-Bearing Mudstones in the Dameigou Area (Qaidam Basin, NW China): Implications for Paleoclimate, Paleoenvironment, and Organic Matter Accumulation.

The Qaidam Basin is a prominent oil and gas exploration and production base of NW China's Jurassic coal-bearing strata. Coal-bearing mudstones are important source rocks for unconventional reservoirs and can record valuable paleoenvironment and paleoclimate information. Here, geochemical analysis including total organic carbon (TOC), total sulfur, organic carbon isotopic composition, rock pyrolysis, X-ray diffraction, and major and trace elements were carried out on mudstone samples from the Middle Jurassic coal-bearing strata of the Dameigou section in the Qaidam Basin to reveal the paleoclimatic and paleoenvironmental conditions during the deposition of the strata and their controls on organic matter accumulation. Results show that the Middle Jurassic Dameigou and Shimengou formations include three significant stages based on their average TOC values of (3.32%, Stage I; 0.87%, Stage II; and 4.42%, Stage III) from the bottom to the top. The organic matter in mudstones in Stages I and II are mainly derived from terrestrial higher plants, while the organic matter has mixed sources of higher plant debris and lower aquatic organisms in Stage III. Paleoclimate parameters indicate that the mudstones in Stage I were deposited under humid and warm conditions, while the climate in Stage II changed to semiarid and warm conditions before turning dry and hot in Stage III. The varying paleoenvironmental characteristics under different paleoclimatic conditions have also been reconstructed. Our results suggest that the accumulation of organic matter in Stages I and II was primarily controlled by redox conditions, while paleoproductivity is the major controlling factor for organic matter accumulation in Stage III.

The Audiovisual Style of Malcolm Clarkes Oral History Documentary

This article is primarily dedicated to an in-depth examination of the audio-visual style employed by documentary filmmaker Malcolm Clarke. This analysis is achieved through a meticulous dissection of scenes, shot composition, and sound elements within three of his notable oral history documentaries, namely, A Long-Cherished Dream, The Lady in Number 6, and Soldiers in Hiding. The article initiates by offering insights into the concept and evolution of oral history documentaries as a distinct subgenre within the broader documentary realm. Subsequently, the article embarks on a critical evaluation of how Clarkes documentaries align with the specific attributes and expectations associated with oral history documentaries. It scrutinizes how Clarke adeptly harnesses a diverse array of cinematic techniques to unearth and present the often-overlooked facets of history, which remain concealed or marginalized within the grander narrative of historical discourse. Through this comprehensive analysis, the article provides a comprehensive assessment of Malcolm Clarkes contribution to the realm of documentary filmmaking and his unique approach to elucidating the lesser-explored dimensions of history.

Frequency-constrained topology optimization in incompressible multi-material systems under design-dependent loads

In the realm of engineering design, structures grappling with fluidic pressure loads within precise frequency constraints necessitate innovative approaches. This study introduces a method to address the intricacies of design-dependent load-based structures, focusing on three key aspects: (i) managing structures constrained by frequency under fluidic pressure loads dependent on the design, (ii) integrating the use of multiple materials, and (iii) dealing with nearly incompressible materials. The proposed approach, detailed in this paper, employs polytopal composite finite elements (PCEs) to overcome the inherent volumetric locking phenomenon in incompressible materials. By incorporating Darcy’s law and a drainage term alongside the representative-solid phase, this approach ensures consistent treatment of fluidic pressure loads, dynamically adjusting their direction and location during the multi-material design process. The porosity of each element, intricately linked to its density variable through a Heaviside function, facilitates a smooth transition between solid and void phases. The application of Darcy’s law establishes a specific pressure field, solved using PCEs, enabling the computation of consistent nodal loads. This method simplifies the assessment of load sensitivities through the adjoint-variable technique. The method’s effectiveness and reliability are validated through numerical examples, demonstrating its capability to optimize compliance within specific volume constraints for frequency-limited structures subjected to design-dependent pressure loading and considering a diverse range of materials from compressible to nearly incompressible.