Mesh Material Research Articles

Improving bond performance of ribbed steel bars embedded in recycled aggregate concrete using steel mesh fabric confinement

To investigate the bond behaviour of passively confined-recycled aggregate concrete (RAC), centre pull out tests were carried out on deformed steel bar with a diameter (Ø) of 12 mm. The recycled concrete aggregate (RCA) replacement ratios are 0, 30, 50, and 100 %. To investigate local bond strength, a short anchorage bonded length (La) of 10 was chosen. Steel mesh fabric (SMF) cylinders were used to confine the RAC around the bonded length of the bar. SMFs have diameters of 4Ø and 6Ø. SMF cylinder reinforcement ratios were estimated to be 0, 2.33, 3.04, 3.5, and 4.56 %. To accurately estimate maximal rising ratios in bond strength response owing to RAC confinement using SMFs, all specimens are intended to fail in the pull out mode (rather than the splitting mode). Unconfined and confined pull out specimens were tested for failure mechanism, ultimate local bond strength, bond stress-slip response, and ductility. When compared to similar unconfined specimens, confinement utilising SMFs dramatically improved bond stress-slip behaviour for all specimens including RCA. Ultimate bond strengths of RAC-unconfined specimens were 3.7–24.5 % lower than those of NAC-unconfined specimens, whereas ultimate slips of RAC-unconfined specimens were 25–140 % higher than those of NAC-unconfined specimens. Due to the usage of SMF cylinders at various levels of RCA, the ultimate bond strength of all confined specimens was dramatically increased when compared to unconfined specimens. When compared to a control unconfined NAC-specimen, the ductility of unconfined specimens containing 30 %, 50 %, and 100 % RCA decreased by 5.7, 18.6, and 39.6 %, respectively. In comparison, when compared to similar unconfined specimens, the maximum rising ratios in the ductility of confined specimens containing 0 % RCA, 30 % RCA, 50 % RCA, and 100 % RCA are 44.2 %, 77.9 %, 52.4, and 117.7 %, respectively. A novel proposed formula is developed to compute the ultimate bond strength of RAC while taking into account the influence of concrete grade, RCA content, concrete confinement via SMF, and transverse ties, and its results agree with the experimental results.

Resonant-Based Wireless Power Transfer System Using Electric Coupling for Transparent Wearable Devices and Null Power Points.

This study provides information on the transfer efficiency of four-plate-structured copper plate and metal mesh sheet couplers, the cause of null-power point. The couplers are compared based on the equivalent circuit model analysis, experimental results of fabricated couplers, and simulation results of the High-Frequency Structure Simulator (HFSS) tool. It was confirmed that the metal mesh material exhibits the same performance as the existing copper plate and can be fully used as a coupler material for the electrical resonance wireless power transfer system. In addition, the null-power point phenomenon is only determined by the main coupling and cross coupling between the transmitter and receiver, which are most dominantly affected by the coupler structure.

Experimental Study on Bond Behavior of Glass Textile Mesh in Earth-Based Matrix.

The bond behavior between the textile and the earth-based matrix determined the reinforcement effectiveness of the composite systems. This paper presented a pull-out experimental study on the glass textile mesh reinforced earth-based matrix. The bond behavior was studied using different development length, mesh spacing size and matrix thickness, with a total of 32 experimental specimens. The test results showed that the peak pull-out force had increased by 31.7% and 40.5% with 200 mm and 300 mm versus 100 mm development length, respectively. The 16 mm compared to 10 mm matrix thickness specimens had a high strength improvement (9.73%) because the elevated thickness had increased the matrix strength. However, the 20 mm versus 10 mm mesh spacing size specimens had achieved a slight reduction (5.72%) due to the reduction in the number of textiles along the weft direction. The failure mode shifted from pulling out, compound modes (both pulling out and textile rupture) to textile rupture mainly accompanied by elevated development length. In addition, we discussed the applicability of the trilinear bond-slip model on the earth-based matrix and proposed a method based on the fracture energy concept for estimating the effective development length, which could provide a reference for future research.

Ferrocement composite columns incorporating hollow core filled with lightweight concrete

The structural performance of lightweight ferrocement box columns filled with different types of lightweight materials is the subject of this study. The experimental study includes eleven square columns with a side length of 200 × 200 mm and a column height of 1000 mm, and the dimension of the inner box is 100 × 100 mm along the length of the column height. Seven Ferrocement Concrete (FCs) columns and four Conventional Concrete Columns (NWCs) were casted and tested under the influence of axial load and eccentric load, where the load is transferred at 20 % of the column width. The FC columns were reinforced using welded wire meshes as an alternative to conventional stirrups. The main factors include the type of lightweight concrete used for the core, column concrete type, the existing steel mesh fabric, the hollow core, and axial eccentric load. Experimental results showed that the Ferrocement concrete FC and different filling materials and using the WWM instead of the traditional stirrup increased the ultimate load by an average of 35 %, and decreased the vertical and horizontal displacement by an average of 21.4 % and 39.2 %, respectively, compared to the NWC control sample. A new proposed equation was derived for forecasting the ultimate load of hollow core ferrocement concrete columns reinforced with steel meshes. The results closely match the experimental findings of earlier studies.

Impact of COVID-19 on clinical outcomes of robotic inguinal hernia repair.

To investigate the impact of the COVID-19 pandemic on the clinical impact of the clinical outcomes of robotic inguinal hernia repair. Patients who underwent RIHR 2 years before and after March 10, 2020, were included in this retrospective study and assigned accordingly to the pre- or post-COVID group. Pre-, intra-, and postoperative variables including patients' demographics, hernia characteristics, complications, and hernia recurrence rates were compared between groups. 183 (94.5% male) and 141 (96.4% male) patients were assigned to the pre- and post-COVID groups, respectively. Patient demographics and medical comorbidities did not differ between groups. Operative time was approximately 40min longer in the post-COVID group (p < 0.001) with higher rates of bilateral IHR (pre-COVID: 30.1% vs. post-COVID: 46.4%, p = 0.003). Mesh material differed between groups with predominance of polyester mesh in the pre-COVID group vs. polypropylene in the post-COVID one. Median hospital length of stay (LOS) was 0days in both groups, and same-day discharge rates were 93.4% pre-pandemic and 92.8% post-pandemic (p = 0.09). There were no pulmonary complications recorded in either group or no cases of COVID-19 detected within two weeks postoperatively in the post-COVID group. Seromas were more frequent in the post-COVID group (pre-COVID: 2 vs. post-COVID: 8, p = 0.018) and no hernia recurrences were recorded. This is the first study to describe the impact of COVID-19 on RIHR. Clinical outcomes and hernia-specific complications were not impacted by the COVID-19 pandemic.

Influence of BFRP Mesh on UHPC Wet Bonding Performance

As an effective method of strengthening concrete in the marine environment, wet bonding has maintained an efficient application mode for many years. At present, research on the wet bonding behavior of UHPC is very rare, so in order to investigate the interfacial bonding performance between basalt fiber-reinforced plastic (BFRP) mesh cloth and ultra-high performance concrete (UHPC) under wet bonding conditions, forty-eight BFRP-UHPC specimens were carried out to investigate the influence of dry/wet bonding type, mesh depth, and mesh thickness on the interfacial bonding performance between BFRP and UHPC, and the failure mechanism of the BFRP-UHPC interface was revealed by SEM detection. The test results show that the interfacial wet bonding performance between BFRP and UHPC is better than that of the dry bonding process. With the increasing thickness of BFRP mesh, the interfacial bonding stress of dry and wet bonding shows the opposite trend, respectively. The fiber interlayer structure is the weak link of BFRP; with the increase in mesh depth, the bonding normal stress decreases gradually. When the mesh depth of wet-bonded BFRP is 5 mm, the reinforcement effect is the best, the maximum increase of interfacial bonding stress is 74%, and the tensile strength ratio is as high as 1.74. Compared with the traditional FRP reinforced construction without fiber mesh, the BFRP mesh structure can greatly improve the wet bonding performance, which can provide a theoretical and experimental basis for the design and construction of UHPC wet bonded with BFRP reinforcement engineering. Due to the form and distribution direction of steel fiber, a mechanical occluding effect will be generated at the BFRP mesh, so these two factors are very valuable for this wet bonding research field, for which the related work needs to further proceed.

Combining Microstructured Surface and Mesh Covering for Heat Transfer Enhancement in Falling Films of Refrigerant Mixture

The article presents the experimental results of combining a basic microstructure with partly closed pores and a mesh covering for heat transfer enhancement at the film flow of a refrigerant mixture. To reveal the effect of the combined structure, heat transfer on a microstructured surface without a covering as well as on a smooth surface with a mesh covering only has been studied. All experimental series were carried out using a binary mixture of R114 and R21 refrigerants. The mixture film flowed down the outer surface of a vertical cylinder in the undeveloped turbulence regime, when the film Reynolds number varied from 400 to 1300. It is shown that a microstructured surface with a fin pitch of 200 μm, fin height of 220 μm, and longitudinal knurling pitch of 160 μm, created by deformational cutting, demonstrates significant heat transfer enhancement: up to four times as compared to a smooth surface. However, adding a mesh covering with an aperture of 220 μm and a wire diameter of 100 μm reduces the intensification. The mesh covering overlaid on a smooth surface also does not provide heat transfer enhancement as compared to the smooth surface itself. The absence or even deterioration of heat transfer enhancement on surfaces with mesh covering can be primarily associated with the low thermal conductivity of the mesh material and shortcomings of the applied method of mesh mounting. The possibility of deteriorating vapor removal due to the incorrect selection of mesh covering parameters was also analyzed. The heat transfer coefficient values obtained for basic microstructured surfaces were compared with the dependencies available in the literature for predicting pool boiling heat transfer on microfinned surfaces.

Experimental study on mechanical properties of Textile Reinforced Concrete (TRC)

Textile-reinforced concrete (TRC) is a variant of reinforced concrete in which textiles are used in place of steel reinforcing bars. Reinforcing the concrete with steel means increasing its tensile strength, but steel also corrodes and wears out over time. The TRC is a novel idea that has the potential to overcome these drawbacks. TRC is a composite reinforcing material that is made from cement and has the benefits of being resistant to corrosion, having a high bearing capacity, and performing well in terms of its fracture limit. The principal function of TRC in buildings has been as reinforcement and as a means of enhancing the ductility and performance of concrete. This experimental work utilizes a 145 gsm (grams squared per meter) alkali-resistant (AR) glass fiber textile mesh. Specimens were cast with and without fibers, and the number of layers was increased from 1 to 3 at 25 mm spacing. In this experimental work, the mechanical behavior of TRC was investigated by conducting tests on its impact, compressive, and flexural strengths. From these results, the TRC specimen exhibits more flexibility than the control specimen. The TRC specimen bends under force and returns to a new position when the load is removed, indicating a good energy absorption capability. As a result, it infers that the specimen with fibrehave the capacity to withstand a higher maximum load than conventional specimens. TRC has a greater fracture control system compared to conventional steel-reinforced concrete.

SJLA_2024_A14: Five-year Outcome of Laparoscopic Ventral Hernia Repair with Phasix ST

Background: Repair of ventral and incisional hernias repair (VIHR) is a standard procedure; newly introduced resorbable mesh biomaterials provide an attractive option to reduce the use of permanent synthetic mesh in hernia surgery and reduce its complications. Indeed the data of Phasix resorption started to occur postmaturation of the wound tissue. However, data on the use of slowly resorbable mesh materials remain scarce, and this study aims to evaluate the use of Phasix ST in the laparoscopic repair of VIHR. Methods: This is a retrospective study of a sequential cohort of patients undergoing laparoscopic VIHR utilizing a Phasix ST mesh. Perioperative characteristics and clinical outcomes were collected. Results: In total, 26 patients, including 19 females and 7 males, underwent laparoscopic VIHR using Phasix ST from April 2016 to January 2023. All surgeries were performed in a single institution by the same surgeon. The average patient age was 52.6 years, and the mean body mass index was 35.5. All patients had a clean wound classification. The average defect size was 136.4 cm2. All patients were seen in the clinic with a median follow-up of 48 months. We observed four wound seromas, no wound infections, and three recurrences during the 5-year follow-up period. All occurred in the center of the mesh with severe adhesions to the mesh and tacker. Conclusion: Five years of follow-ups showed 11% recurrence in the same site note, which needs to be reviewed. Further, 10 years of follow-up results need to be assessed.

Experimental Study on Structural Behaviour of Steel Wire Mesh under Impact Loading

In view of application to debris flow/rockfall barrier system, several types of steel wire mesh were selected to verify their basic behaviour under impact load of free fall weight at the controlled testing environment at an in-house testing facility capable of dropping a heavy weight on approximately 1-meter square panel made of such steel wire mesh material. Out of the 3 types of wire mesh tested, high-performance chain link endured the highest impact load energy, while newly developed wire mesh showed a high potential of effectively absorbing the impact energy by its plastic deformation along the total length of wire components. Both of the above two types of wire mesh are expected to be applied in flexible type debris flow catchment system in combination with larger opening mesh such as ring net. The newly developed wire mesh consisting of spirally deformed steel wires behaved as energy-absorbing elements while transmitting the impact load to the supporting ropes by its own plastic deformation along the total wire length.

О практических методах определения порометрических характеристик тонких образцов из комбинированного пористого сетчатого материала

On the example of a porous structure operation in the gas-liquid flow as the phase separator, the paper demonstrates the porometric characteristics effect to assess its performance in the capillary-type intra-tank devices of the space propulsion system fuel tanks. It is shown that for manufacture of a permeable phase separator taking into account the stable capillary structure and the possibility to obtain the hydraulic resistance given value, it is advisable to introduce a combined porous mesh material. For practical determination of one of the porous structure characteristics, i.e. the capillary holding capacity, a method is presented for preparing the permeable structure surface of the phase separator material for testing based on the “bubble” technique, and principles of using such wetting liquids as water, glycerin or ethyl alcohol are discussed. Taking into account small thicknesses of the phase separators made of combined porous materials, types of the circuit solutions of the test installations are provided for determining the capillary holding capacity of porous mesh materials differing from the traditional ones used in orosimetry of soils, rocks and filter materials obtained on the basis of powder metallurgy.

A Review on Use of FRP Mesh and Bamboo Fiber Composite Material for AAC Block Masonry Wall Strengthening and Water Resistance

Abstract: For the purpose of strengthening masonry walls, externally bonded composite materials offer a desirable solution. Current studies in this area demonstrate that the use of fiber-reinforced polymers (FRPs), which are externally bonded composite materials, improves the strength, stiffness, and ductility of the wall under loads while maintaining the wall's integrity at failure

Multiple Small Bowel Fistulae Secondary to Mesh Erosion: A Rare Presentation

Synthetic mesh placement has proved to be a boon for repairing different types of hernias and also vaginal vault prolapsed. However as with all procedures, there are certain risks involved. Mesh migration and erosion in bowel is a rarely reported complication of using synthetic mesh. We report an elderly sixty two year old woman presented with abdominal pain and incisional hernia after being previously operated for abdominal hysterectomy and mesh sarcocolopexy for subsequent vault prolapse ten months ago. Patient planned for open mesh hernioplasty but was intra operatively found to have multiple ileal fistulae secondary to mesh erosion. It is important to consider the possibility of mesh erosion or migration in all patients who present with post synthetic mesh procedures- rare as the incidence may be. Use of specific mesh and suture materials is as important as technique in the primary surgery to prevent such a complication in the first place.

Hatched Eggshell Membrane Can Be a Novel Source of Antioxidant Hydrolysates to Protect against H2O2-Induced Oxidative Stress in Human Chondrocytes.

Natural antioxidants derived from agricultural by-products have great promise and ecological advantages in the treatment of oxidative stress-related diseases. The eggshell membrane (ESM) from hatched eggs, i.e., the hatched ESM, is a globally abundant agricultural byproduct, and its high-value utilization has been rarely studied compared to the well-studied ESM from fresh eggs. In this research, we systematically characterized the hatched ESM as a novel source of antioxidant hydrolysates and explored their potential role in H2O2-induced human chondrocytes. The results showed that the hatched ESM is a protein-rich fibrous mesh material with a significantly different structure and composition from those of fresh ESM. Enzymatic hydrolysis of hatched ESM can produce antioxidant hydrolysates rich in low molecular weight (MW) peptides, which mainly derived from the Lysyl oxidase homolog by Nano-LC-MS/MS analysis. The peptide fraction with MW &lt; 3 kDa (HEMH-I) exhibited the highest DPPH radical scavenging, Fe2+-chelating, and Fe3+-reducing abilities. In H2O2-induced human SW1353 chondrocytes, HEMH-I treatment significantly increased the cell viability and ameliorated oxidative stress, inflammatory response, and cartilage matrix degradation by reducing the level of ROS, matrix metalloprotease 3 (MMP3), MMP13, and IL-6, and by promoting the expression of SOD and type II collagen, potentially through activating the cellular Keap1/Nrf2/HO-1 pathway. This study provides a theoretical basis for the value-added application of hatched ESM waste to produce antioxidant hydrolysates and indicates their potential as functional food and pharmaceuticals.

Absorbable mesh in a contaminated field: hernia repair outcomes.

Hernia repair mesh aids in the stability of incisional hernia repair and can reduce the need for subsequent operations. There is, however, debate among surgeons over which type of hernia mesh-synthetics, biologics, or biosynthetics-is indicated as best for specific patients. A retrospective case review comparing surgical outcomes based on wound class and mesh materials may provide insights into this question. This study evaluates patient outcomes using biosynthetic mesh based upon CDC wound classification. Following Institutional Review Board approval, the local National Surgery Quality Improvement (NSQIP) databases were queried for open ventral hernia repaired with absorbable mesh implants from January 2013-December 2017. Factors for comparison included patient demographics, operative details, and an analysis of clinical outcomes. Our study identified 112 ventral hernia repair cases with absorbable mesh placement, 32% (n = 36) were wound classes II-IV. Higher wound class correlated statistically with diabetes (33.3%), prior hernia repair (61.1%), and parastomal hernia (44.4%). Higher wound classes were associated with more emergent presentations, involved bowel resection more frequently, required larger mesh implants, increased post-operative surgical site infections, and wound disruption. Increasing wound class was also associated with longer hospital stays and greater need for readmission (38.9% vs. 11.8%). Compared to patients with clean wounds, biosynethic mesh repair patients with contaminated wounds exhibited more emergent presentations, increased incidence of bowel resection, increased mesh size, and more readmissions. Despite these peri-operative outcomes, hernia recurrence rates among biosynethic mesh hernia repair were similar in CDC class II-IV patients as class I.

Mesh-tissue integration of synthetic and biologic meshes in wall surgery: brief state of art.

Many studies show that surgical hernia repair with the use of prosthetic meshes can result in pain, hernia recurrence, contraction and mesh rupture. Numerous experimental studies have been conducted to understand the effect of mesh stiffness, pore size and mesh patterns on mesh biocompatibility. The purpose of this mini review is to present an overview of the contracture, adhesion, tissue regrowth and histological response characteristics of permanent and absorbable mesh. Indeed, the mechanics of mesh-human tissue interaction is poorly understood in the literature. It has been shown that early integration of biological meshes is critical for sustained hernia repair. One of the emerging experimental approaches is to combine cell-based regenerative medicine with mesh materials. Studies in preclinical models show that the use of synthetic and biological meshes with autologous cell implantation improves the biocompatibility of biomaterials, promoting key tissue regeneration processes such as adhesion and vascularisation.

Experimental analysis of corroded RC continuous beams rehabilitated by ICCP-SS under unsymmetrical loading

In this study, a total of 14 corroded reinforced concrete (RC) continuous beams rehabilitated by a dual function system—Impressed Current Cathodic Protection-Structural Strengthening (ICCP-SS) with carbon-fabric reinforced cementitious matrix (C-FRCM), were tested under in-plane bending (resulted from unsymmetrical loading) to investigate the influences of corrosion rate, layer of carbon fabric mesh, complete wrapping as the end anchorage and loading scheme. The flexural behaviour including failure modes, load-carrying capacities, load-deflection curves and ductilities of the specimens were carefully studied. The design flexural strengths were calculated based on the current design guidelines, which were compared with the experimental results. It’s shown from the experimental data of five-point bending tests that beams strengthened with C-FRCM had higher yielding loads and ultimate loads than corroded beams without rehabilitation. However, the ductility of RC continuous beams was weakened by the C-FRCM strengthening method and its anodic polarization process, in particular for the specimens with more layers of carbon fabric meshes in prefabricated C-FRCM plates and complete wrapping as the end anchorage. Under unsymmetrical loading scheme, the delamination failure of concrete cover was observed and the application of complete wrappings was found to improve the ductility of the specimen. Comparison of the measured and predicted moment capacities showed that the current design guidelines generally underestimate the moment capacities of C-FRCM strengthened RC continuous beams, especially the specimens further strengthened by complete wrapping.

A Flexible and Highly Sensitive Capacitive Pressure Sensor With Microstructured Dielectric TPU Layer Based on Mesh Fabric as Template

Flexible and highly sensitive capacitive pressure sensors have outstanding privileges, such as good stability, simple structure, low power consumption, small hysteresis, and low-temperature effect. However, their challenging preparation method is an obstacle to being industrialized. To address this issue, a simple and low-cost method has been proposed in the present work by which highly sensitive capacitive pressure sensors can be feasibly constructed. First, the thermoplastic polyurethane (TPU) layer was obtained by employing two-step replication and using the stainless-steel mesh fabric as a template. Then, the dielectric TPU layer was assembled with conductive fabric electrodes to form the capacitive pressure sensor. There is no need to apply expensive professional equipment with high precision during the formation process of the present capacitive pressure sensor as it is easy to control the microstructure of the TPU film by changing templates. Eventually, the microstructured dielectric TPU layer is prone to deform with external pressure, resulting in superior sensing performance of the sensor, such as high sensitivity of 0.182 kPa <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^{-{1}}$ </tex-math></inline-formula> , a short response time of 78 ms, a low detection limit of 15 Pa, as well as remarkable pressure resolution and good stability. This capacitive pressure sensor is also able to detect several human movements, such as finger bending, finger pressing, fist-clenching, and swallowing, indicating its applications in electronic skin, smart wearable, and human–computer interaction.

Understanding and exploiting crystal formation during sodium chloride crystallization on 3D-printed mesh materials

Though crystallization is one of the oldest separation and purification processes, understanding and controlling it can be challenging. In this study, 3D-printed meshes were developed and tested for sodium chloride (NaCl) crystallization in two different configurations: one involving a stagnant NaCl solution and one using a flow-through crystallizer. Experiments with the stagnant NaCl solution investigated the effect of the coverage of the 3D-printed meshes and the roughness on solid salt recovery and size, while the flow-through crystallizer testing investigated the effect of solution/air interfaces in contact with the mesh on solid salt recovery and size. Higher solid salt recoveries were achieved for a mesh with a coverage of 52.24% and by increasing the solution/air interfaces in contact with the meshes; roughness changes did not have any significant effect on solid salt recovery. Finally, a potential mechanism explaining the salt formation from the solution/air interface towards the non-immersed portion of the mesh was developed.

Mechanical Properties of Cork Composite Boards Reinforced with Metal, Glass Fiber, and Carbon Fiber

For effective applicability of reinforced cork, cork composites reinforced with metal, glass fiber, and carbon fiber were developed, and the effects of the reinforcing materials on the mechanical properties of cork composites were investigated. The bending moduli of elasticity (MOE) of cork composites were in the 32.7–35.9 MPa range, while the bending strength values were in the 1.62–1.73 MPa range. The strength performance decreased in the order cork-metal &gt; cork-carbon fiber &gt; cork-glass fiber. The bending MOEs were improved by 29%–41% compared with simple cork boards, while the bending strengths of reinforced cork were 35%–45% higher. The strength performance significantly improved following the incorporation of thin mesh materials into the middle layer of the studied cork composites. The bending strains of the cork composites were remarkably higher compared with oak wood, making them promising for applications that require bending processing, such as curved jointing. The internal bond strengths of the cork composites were 0.26–0.44 MPa, approximately 0.36–0.60 times lower compared with medium-density fiber boards.