Bundle Strength Research Articles

Characterization and Spinning Performance of Pineapple Leaf Fibers: An Economic and Sustainable Approach for Bangladesh

ABSTRACT The by-products of pineapple fruits such as stems and leaves are generally considered as agro-wastes, but these wastes can be used as raw materials for reinforced fibre, yarn and eventually in fabric formation. Unlike PALF, Jute is a bast fibre and one of the main cash crops of Bangladesh, which has already proven as a versatile fibre. In this study, the spinning performance of PALF such as fineness, bundle strength, breaking tenacity and breaking elongation properties have been studied and compared with jute. It showed that the physical and structural characteristics of PALF were similar to jute fibre, even in some cases PALF is better. Another study was done in which it was found that surface characteristics like color strength (K/S value), whiteness, yellowness, and brightness signifies that the PALF yarn is almost similar in comparison with jute yarn. Besides, Pineapple Leaf Fibres contained relatively greater diameter compared with that for jute fibre and consequently, the quality ratio value of yarn for PALF was much smaller than that of jute yarn. Finally, a comparative decision is made; that the use of PALF can be a sustainable replacement toward an economy based agricultural solution for Bangladesh.

Lengthwise jute fibre properties variation and its effect on jute–polyester composite

In this study, the jute reeds were equally divided lengthwise from root to tip in three portions namely root, middle and tip. The fibre diameter, fineness, tensile strength and bundle strength of the three portion jute were evaluated and compared. Unidirectional composites containing about 35(wt/wt)% jute fibre by weight were produced in unsaturated polyester resin matrix. The effect of fibre property variation in composite’s mechanical properties was studied. Tensile and flexural properties of composites made from three portions of jute reed were studied. It was observed that tensile and flexural strength of root portion based composites are 44% and 35% higher than tip portion based composites. Tensile and flexural modulus of tip portion based composites is 18% and 17% higher than root portion based composites.

Relationship Between Classer Grade, the 3-digit Color and Trash Grade Attained From the H.V.I.

This study was carried out at Plant Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Egypt during 2015 and 2017 seasons to study the relationship between classer grade, the 3-digit color and trash grades attained from the H.V.I. Three Egyptian cotton varieties i.e., Giza 86, Giza 87 and Giza 90 with different lint cotton grades were used. The obtained results revealed significant correlation coefficients (r =0.76, r =0.75 and r =0.77) between the classer grade (C.G) and instrumental grade (I.G.) for the studied three cottons varieties, respectively. Also, the significant correlation coefficients (r =0.82 and r =0.36) were found between classer grade (C.G) and 3-digit color grade (3-D.C.G.), respectively, for Giza 86, Giza 87 only. The multiple regression model was used to calculate the relative contribution and to predict the classer grade (C.G), the instrumental grade (I.G.) through the H.V.I. fiber properties. The relative contribution percentage of H.V.I. fiber properties to the classer grade, the instrumental grade, the 3-digit color grade and the spinning consistency index was determined. The reflectance degree (Rd%) recorded the highest relative contribution percentage to the classer grade (C.G) of Giza 86 and Giza 90 cotton varieties, while, the fiber bundle strength was the highest contributor to the classer grade of Giza 87.

Interfacial adhesion between carbon fibers and nylon 6: Effect of fiber surface chemistry and grafting of nano-SiO2

In this study, the effect of carbon fiber (CF) surface chemistry and grafting of nano-SiO2 on CF surface with respect to the interfacial adhesion of CF-reinforced nylon 6 composites was investigated. CFs were oxidized and reacted with poly(oxypropylene) diamines to modify the surface chemistry. The oxidized CFs were modified with 3-aminopropyltriethoxysilane and then grafted with SiO2 nanoparticles. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microcopy (SEM), and atomic force microscopy (AFM) were used to characterize the chemistry and topographies of the CF surface. The transverse fiber bundle strength of CF oxidized and grafted nano-SiO2 increased to 31.92 MPa and 39.35 MPa, respectively, from 12.57 MPa for untreated CF. The results indicated that the reaction between the carboxyl group and nylon 6 led to chemical bonding at the interface and it meanwhile was strengthened and toughened by uniformly distributed SiO2 nanoparticles on the CF surface.

A Comparative Analysis of Cytoplasmic Effects on Lint Yield and Fiber Quality between CMS‐D2 and CMS‐D8 Systems in Upland Cotton

Hybrid vigor has been extensively used in crop production based on cytoplasmic male sterility (CMS). In upland cotton (Gossypium hirsutum L.), although CMS‐D2 has been extensively studied, the cytoplasmic effects of CMS‐D8 are currently unknown. The objectives of this study were to investigate the effects of CMS‐D8 cytoplasm using four pairs of reciprocal hybrids between a D8 restorer and four commercial cultivars, in comparison with another four pairs of reciprocal hybrids between a D2 restorer and the same cultivars. Across four crosses in four replicated field tests, the hybrids with D8 cytoplasm averaged 21% lower lint yield (LY), 10% lower lint percentage (LP), 7% lower boll weight (BW), and 11% lower micronaire (MIC) than their reciprocals with upland cytoplasm. However, the two groups of reciprocals had no overall difference for upper half mean length (UHML), uniformity index (UI), fiber bundle strength (STR), fiber elongation (ELO), and short fiber content (SFC). As a comparison, the four hybrids with D2 cytoplasm averaged 3 to 6% lower in LY, LP, BW, and ELO but improved UHML and STR by 7 to 8% and reduced MIC by 4% and SFC by 16% compared with their reciprocals with upland cytoplasm. However, D8 cytoplasm showed no significant negative effect on LY and LP in one test and on BW across the tests. It is concluded that the cytoplasmic effects from the two CMS systems are different, and CMS‐D8 presents a much greater challenge in reducing its large deleterious effects on LY before this CMS system can be used in commercial hybrid seed production.

Strength of filament bundles – The role of bundle structure stochasticity

Most biological fibrous materials are hierarchical, in the sense that fibers of finite length assemble in bundles, which then form networks with structural role. Examples include collagen, silk, fibrin and microtubules. Some artificial fiber-based materials share this characteristic, examples including carbon nanotube (CNT) yarns and unidirectional composites. Here we study bundles in which filaments do not break, while bundle rupture happens by the failure of inter-filament crosslinks, followed by pull-out. In all cases, the crosslinks are randomly distributed along interfaces. The strength of such bundles depends on material parameters of the filaments and crosslinks, such as their stiffness and strength, and on the cross-link density. We focus on the dependence of the bundle strength on two parameters: filament waviness and filament staggering. Bundles with regular staggering are stronger than those with stochastic staggering. We identify the optimal regular staggering that maximizes the strength. Filament waviness increases the strength of stochastically staggered bundles at constant crosslink density but decreases the strength of regularly staggered bundles. Results for bundles with permanent crosslinks, which never reform once they break, as well as transient crosslinks capable of reforming during deformation are presented, and it is shown that the general trends are independent of the nature of the crosslinks. The results are discussed in the context of collagen and carbon nanotube bundles.

Identifying an Improved Jute Variety Preferring Physico-chemical Properties

There are so many fibres, but not all of them are textile. Textile materials are generally soft, flexible, and capable of being transformed into desired shapes without resistance and durable over a reasonable period of wear. Jute –the Golden fibre of Bangladesh is used widely for various purposes. For the assessment of fibre quality of three types of jute fibre e.g. newly released jute variety-72, bleached fibre and variety O-9897 were considered for the analysis of physical properties (Reed jute fibre length, Brightness index, Whiteness index, Bundle strength and Fineness index) and chemical analysis (Cellulose, Hemicellulose, Lignin, Ash content, Fat/Oil content, Oil content in jute seed, Pectin content and safonification value) under the present study.Some field level morphological information was taken as quality contributing characteristics. The study was conducted at the Chemistry Division, Textile Physics Division and Pilot Plant and Processing Division of Bangladesh Jute Research Institute, Dhaka, Bangladesh during 2017-2019. The assessment of physico-chemical properties of the variety O-72 was blue seeded with lower percentage of oil content than naturally brown seeded but saponification value was higher, Brightness (22.04%), fineness (36.26%) and bundle strength (06.20 lb/mg) index were very much comparable to bleached jute samples using 6% hydrogen peroxide. Cellulose content was 65.68% as well as lignin and hemicelluloses content were 13.95% and 17.94% respectively which were more prominent than O-9897 varieties of jute fibres.

Compressive strength of flax fibre bundles within the stem and comparison with unidirectional flax/epoxy composites

Flax (Linum usitatissimum L.) fibres are commonly used as reinforcement of composite materials. Nevertheless, literature shows that the compressive strength of flax-based composites is rather modest compared with materials reinforced by synthetic fibres. The present article investigates the compressive strength of flax fibre bundles both within the stems and in unidirectional (UD) composites. In this way, an optimised arrangement of fibre bundles inside the plant is assumed. Damage mechanisms are found to be similar in the stem and within flax-based UD materials, namely by buckling of fibre bundles, a typical failure mechanism of UD composites. Inside the stems, this phenomenon is highlighted by nanotomography, which underlines the key role of the woody core in the buckling resistance of the plant. For UD, failure can also be studied by scanning electron microscopy (SEM). The same ranges of average compressive strength values are estimated for flax fibre bundles, being 206 MPa within the stem and 242 MPa within UD composites. Finally, this study highlights that, if a flax stem is an optimised natural structure, the compressive strength of flax fibre bundles seems to be a limiting factor for structural applications of flax-based composite materials.

Hybrid polyurethane and silane sized carbon fibre/epoxy composites with enhanced impact resistance

A hybrid sizing agent of polyurethane and silane is synthesized and used on carbon fibre surfaces with different sizing rates to enhance the interfacial bonding between carbon fibre and epoxy matrix in the composites. The proposed sizing mechanism is studied. With successful and suitable rate of sizing on the carbon fibre surface, both the tensile strength and wear resistance of carbon fibre bundles significantly increase. Meanwhile, the wettability of the carbon fibre with epoxy is improved with a suitable amount of hybrid sizing on the fibre surfaces, which can directly enhance the impregnation process during fabrication of the composite. The interlaminar shear strength and impact resistance of the composites are enhanced by the sized carbon fibres. B scan and C scan images of the composites after impaction show that the damage areas in the thickness direction and within the plane decrease significantly when carbon fibres with an optimised sizing rate are used in the composites. The impact stress can be effectively transferred to the resin in the composite due to the hybrid sizing on the fibre surfaces enhancing the bonding strength between fibres and matrix, providing a feasible way to enhance the impact resistivity of the composites.

Avalanche dynamics in higher-dimensional fiber bundle models

We investigate how the dimensionality of the embedding space affects the microscopic crackling dynamics and the macroscopic response of heterogeneous materials. Using a fiber bundle model with localized load sharing computer simulations are performed from 1 to 8 dimensions slowly increasing the external load up to failure. Analyzing the constitutive curve, fracture strength and avalanche statistics of bundles we demonstrate that a gradual crossover emerges from the universality class of localized behavior to the mean field class of fracture as the embedding dimension increases. The evolution between the two universality classes is described by an exponential functional form. Simulations revealed that the average temporal profile of crackling avalanches evolves with the dimensionality of the system from a strongly asymmetric shape to a symmetric parabola characteristic for localized stresses and homogeneous stress fields, respectively.

Fiber-bundle model with time-dependent healing mechanisms to simulate progressive failure of snow.

Snow is a heterogeneous material with strain- and/or load-rate-dependent strength. In particular, a transition from ductile-to-brittle failure behavior with increasing load rate is observed. The rate-dependent behavior can partly be explained with the existence of a unique healing mechanism in snow that stems from its high homologous temperature (temperature close to melting point). As soon as broken elements in the ice matrix get in contact, they start sintering and the structure may regain strength. Moreover, the ice matrix is subjected to viscous deformation, inducing a relaxation of local load concentrations and, therefore, further counteracting the damage process. Ideal tools for studying the failure process of heterogeneous materials are the fiber-bundle models (FBMs), which allow investigating the effects of basic microstructural characteristics on the general macroscopic failure behavior. We present an FBM with two concurrent time-dependent healing mechanisms: sintering of broken fibers and relaxation of load inhomogeneities. Sintering compensates damage by creating additional intact, load-supporting fibers which lead to an increase of the bundle strength. However, the character of the failure is not changed by sintering alone. With combined sintering and load relaxation, load is distributed from old stronger fibers to new fibers that carry fewer load. So as we additionally incorporated load redistribution to the FBM, the failure occurred suddenly without decrease of the order parameter-describing the amount of damage in the bundle-and without divergence of the fiber failure rate. Moreover, the bvalue, i.e., the power-law exponent of frequency-magnitude statistics of fibers breaking in load redistribution steps, at failure converged to b≈2, a value higher than that of a classical FBM without healing (b=3/2). These results indicate that healing, as the combined effect of sintering and load relaxation, changes the type of the phase transition at failure. This change of the phase transition is important for quantifying or predicting the failure (e.g., by monitoring acoustic emissions) of snow or other materials for which healing plays an important role.

Analysis of Cotton Fibre Properties: A Data Mining Approach

The quality of cotton fibre is often characterized by its various physical properties, like bundle strength, elongation at break, fineness, mean length, maturity ratio, short fibre content, neps etc. As cotton is a natural fibre, all of its properties are always subjected to variation, thereby, influencing the characteristics of the final yarn. In this paper, these cotton fibre properties are analyzed in details using various tools of data mining. Decision tree is at first developed so as to identify the most predominant property affecting the spinnability of cotton fibres. It is also adopted to study the effects of different cotton fibre properties on yarn tenacity and unevenness. The developed dendograms help in identifying pairs or groups of cotton fibres having almost similar properties. On the other hand, cluster analysis acts as a visual decision aid in segregating the considered cotton fibres into different groups having maximum intraclass similarity and minimum interclass similarity to determine the constituent fibres in the final blend. These data mining techniques can also be implemented to study the physical characteristics of other natural fibres.

Validation study on the theory of composites by using three-dimensional printing technology

RoM, as a reinforcement theory of composite materials, has been widely used. With the advent of new materials and molding processes, this theory is constantly being refined and validated. In this paper, four high-tech fibers as continuous reinforcing materials and carbon nanotubes as non-continuous reinforcing materials were evaluated, and two ideal composite samples were designed using three-dimensional printing technology. The reliability of RoM was verified by tensile testing. Also, a fiber tensile fixture was designed. The fiber bundle strength was inversely proportional to the length and the number of roots of fiber. In verifying the RoM, three-dimensional printing was employed, showing the diversity and complexity of the testing samples.

Preparation of PLGA/MWCNT Composite Nanofibers by Airflow Bubble-Spinning and Their Characterization.

Poly(lactic-co-glycolic acid) (PLGA)/multi-walled carbon nanotube (MWCNT) composite nanofibers have been successfully fabricated via airflow bubble-spinning. In this work, a systematic study of the effects of solution concentration, relative humidity (RH), and composition on the morphology of PLGA nanofibers is reported. By comparing the distribution of fiber diameter, we found that the spinning effect was the best when the temperature was kept at 25 °C, the collecting distance 18 cm, the concentration 8 wt %, and the relative humidity 65%. MWCNTs used as added nanoparticles were incorporated into the PLGA nanofibers. The volatile solvents were used to achieve the purpose of producing nanoporous fibers. Besides, the rheological properties of solutions were studied and the PLGA or PLGA/MWCNT composite nanofibers with a nanoporous structure were also completely characterized using scanning electron microscope (SEM), a thermogravimetric analyzer(TGA), X-ray diffraction(XRD) and Fourier-transform infrared (FTIR) spectroscopy. In addition, we compared the mechanical properties of the fibers. It was found that the addition of MWCNTs significantly enhanced the tensile strength and elasticity of composite nanofibers without compromising the nanoporous morphology. The results showed that the breaking strength of the composite fiber bundle was three times as strong as the pure one, and the elongation at the break was twice as great. This work provided a novel technique successfully not only to get rid of the potential safety hazards caused by unexpected static but also prepare oriented nanoporous fibers, which would demonstrate an impressive prospect for the fields of adsorption and filtration.

Vibration Response and Stress Analysis of Planar Elastic Tube Bundle Induced by Fluid Flow

Flow-induced vibration plays a positive role on heat transfer enhancement. Meanwhile, it is also a negative factor for fatigue strength. Satisfying the fatigue strength is the primary prerequisite for heat transfer enhancement. This paper numerically studied the flow-induced vibration of planar elastic tube bundle based on a two-way fluid–structure interaction (FSI) calculation. The numerical calculation involved the unsteady, three-dimensional incompressible governing equations solved with finite volume approach and the dynamic balance equation of planar elastic tube bundle solved with finite element method combined with dynamic mesh scheme. The numerical approach was verified by comparing with the published experimental results. Then the vibration trajectory, deformation and stress contour of planar elastic tube bundle were all studied. Results show that the combined movement of planar elastic tube bundle represents the agitation from inside to outside. The vibration of out-of-plane is the main vibration form with the typically sinusoidal behavior because the magnitude of displacement along the out-of-plane direction is the 100 times than the value of in-plane direction. The dangerous point locates in the innermost tube where the equivalent stress can be utilized to study the multiaxial fatigue of planar elastic tube bundle due to the alternating stress concentration. In the velocity range of 0.2‒3 m/s, it is inferred that the vibration amplitude plays a role on the stress response and the stress amplitude is susceptible to the fluid velocity. This research paves a way for studying the fatigue strength of planar elastic tube bundle by flow-induced vibration.

Numerical study on the heat transfer enhancement and fatigue life by flow-induced vibration

In order to analyze the heat transfer enhancement and fatigue life by flow-induced vibration comprehensively, this study investigated the shell-side flow in planar elastic tube bundle heat exchanger based on a two-way fluid structure interaction using the finite volume approach and finite element method combined with a dynamic mesh scheme. This numerical approach was verified by comparing with the Zhukauskas's empirical correlation and the published experimental results. Comprehensive analysis was conducted in fatigue life and heat transfer combined with the effect of tube wall thickness, tube pitch and vibrational Reynolds number. Results indicate that the vibration amplitude is considered to depend more strongly on structural parameters because the average fluctuation 81.85% and 19.55% occur in vibration amplitude and frequency. Vibrational Reynolds number, a combination of amplitude and frequency, dominates the heat transfer enhancement resulting in the minimum heat transfer coefficient ratio 1.08 and the maximum heat transfer coefficient ratio 1.29. It is deduced that the heat transfer enhancement is obtained in the premise of satisfying the fatigue strength of tube bundle in the appropriate vibrational Reynolds number range 147–780 for the planar elastic tube bundle studied in the present paper.

Balanced renewable energy scenarios: a method for making spatial decisions despite insufficient data, illustrated by a case study of the Vorderland-Feldkirch Region, Vorarlberg, Austria

BackgroundAn increasing production of renewable energy requires planning strategies that are able to coordinate the higher-level energy goals with local-level land use interests. While the spatial scope of energy objectives is usually set up on a federal state or national scale, decisions to allocate and implement renewable energy sites are often taken on a municipal scale. This leads to a lack of regional coordination, as the task to achieve a balanced regional energy demand and renewable energy production cannot be solved by individual municipalities alone and calls for cooperation on a regional level.This paper focuses on a recently applied method to support decisions that are committed to empowering the production of renewable energy on a regional scale. In addition, it reflects the generic use of this method, which should be manageable and repeatable under the conditions of an input of only a few quantitative data. At the same time, it addresses the question of how planning decisions, both in spatial and energy planning, may be empowered.MethodsThe research team applied a cardboard games approach that required several steps of analysis. First, energy data and spatial attributes of different renewable energy sources were collected from reference projects and the literature. The end product was a catalogue of renewable energy generators, which also included the estimated energy output (kWh/a) and land consumption (m2) per source. A measuring unit of m2/kWh/a was developed that represented an inverse value for the consumption of heat (kWh/m2/a). Second, the current and future (2030) energy demand of the Austrian region of Vorderland-Feldkirch was estimated for this the pilot study area to which the cardboard games method should be applied, which resulted in two energy demand scenarios for 2030—a “business-as-usual” and an “optimum” scenario. The two scenarios were then related to the current renewable energy goal of the federal state (Vorarlberg) in order to calculate the required share of renewable energy for both the year 2030 and the chosen pilot study area. As a third step, a scenario-building workshop was organized for regional stakeholders and experts in energy planning. About 30 people joined the workshop. There were different backgrounds among the workshop participants: local experts and mayors, researchers from the project itself, and energy and planning experts from Germany, the Netherlands, and Switzerland. The three workshop groups had to develop spatial scenarios for Vorderland-Feldkirch to reach the required share of renewable energy. And as a final step, the resulting strategies derived from the workshop scenarios were evaluated by using a GIS analysis.ResultsThe cardboard games method produced interesting spatial strategies for achieving an equivalent between energy demand and renewable energy production. The main advantage of the method is that it produces quick results and creates awareness of the land consumption of renewable energy. Furthermore, the cardboard games method worked as a participatory approach to simulating a decision-making process in regional (energy) planning.ConclusionsThe estimated energy scenario (2015–2030) is based on several factors that are unfortunately greatly simplified and/or difficult to verify—where the latter is mainly caused by an almost total lack of useable data. On the other hand, the simplification represents the strength of the method bundle, as it ensures a “generic” quality as well as repeatability of the workflow of standard planning situations for many regions, which is also an important part of the research module profile. Still, an in-depth GIS pre-assessment would further enhance and refine the results.

Genetic variability heritability and genetic advance studies in cotton (Gossypium hirsutum l.)

The present experiment was carried out at research farm of Cotton Research Station, Srivilliputtur, to determine genetic variability, heritability and genetic advance estimates in upland cotton. The analysis of variance involving a set of fourty two improved hirsutum genotypes received from various research institutes under AICRP on Cotton for eleven characters viz., Days to 50 % flowering, Plant height, Number of monopodia per plant, Number of sympodia per plant, Number of bolls per plant, Boll weight, Ginning percentage, Upper Half Mean Length, Bundle strength, Micronaire value, and Seed cotton yield (kg/ha) revealed highly significant mean sum of squares for all the characters indicating greater diversity among the genotypes. The value of Phenotypic Coefficient of Variation (PCV) is greater than Genotypic Coefficient of Variation (GCV); it means that the apparent variation is not only due to genotypes but also due to influence of environment. The difference between the estimates of PCV and GCV were low for all the characters except number of monopodia per plant, number of sympodia per plant and number of bolls per plant thereby indicating that lesser role played by the environment in the expression of these characters. The traits like Days to 50% flowering, Plant height, Boll weight, Seed cotton yield (kg/ha), Upper half mean length, Micronaire value and Bundle strength exhibited high broad sense of heritability and moderate sense of heritability was observed for Number of monopodia per plant, Number of sympodia per plant, Number of bolls per plant and Ginning percentage. High heritability coupled with high genetic advance as a percent of mean was recorded for boll weight, seed cotton yield and micronaire value indicated the major role of additive gene action in the inheritance of these characters. Thus, these characters may serve as an effective selection parameter during breeding programme in the upland cotton.

Characterizing Primitive Cotton Acccessions (Gossypium spp.) Collected in Burkina Faso to Identify Potential Sources for Fiber Quality Enhancement in West African Cultivars

African cotton cultivars produce consistent fiber quality. However, they are far from perfect as they are old, with fiber quality lagging compared to modern cotton cultivars produced in competing countries. This study compared cotton accessions collected across Burkina Faso belonging to the four cultivated species to cultivars from West African countries (Benin, Burkina Faso, Mali, and Togo) plus Chad. The objectives were to quantify the fiber quality components within the collection and to identify accessions with the potential to enhance the fiber quality of African cultivars to address evolving markets and environments. In terms of lint percent, accession E32 (G. hirsutum) outperformed all cultivars by 2.5 to 4.6%. Accessions E25, E1, and E12 (all G. barbadense), and E53 (G. hirsutum) produced fibers 1.7 to 4.6 mm longer than the control cultivars, except for cultivar FK37. All G. hirsutum, G. barbadense, and G. herbaceum accessions had longer fibers than all control cultivars. Some G. hirsutum accessions with perennial tendency, averged 3.5 to 5.5% greater elongation. For fiber strength, all G. barbadense accessions appeared better than comparision cultivars and E13, E38 (G. arboreum), and E43 (G. herbaceum) produced fibers with bundle strength values from 7.3 to 10.2 kN m Kg-1 greater than any comparision cultivar. Further enhancement of certain African cotton fiber properties could be possible through a research-based breeding program to identify and use current variability found in Africian accessions as well as other accessions.

A Study on the Initial Fracture Behavior of CF/GF Intra-Hybrid Woven Fabric Reinforced Composites

In this paper, woven fabrics of glass fiber/carbon fiber intra-hybrid in plain structure were used to fabricate fiber reinforced plastic (FRP) composite by hand lay-up method. The investigation on tensile property was carried out on specimens in 7 orientations including 0°/5°/15°/75°/85°/90° in previous works. With the specimen parameters and experimental data, FEM model was built by the software of Marc. By combining the experimental results and finite element analysis, the modulus was simulated and calculated at the first stage. Then interfacial stress of the 0 degree and 90 degree was also calculated. By the initial fracture stress data from experiment as well as the simulation value of interfacial strength of 0 and 90 degree, the initial fracture stress of the off-axial specimens wascalculated and predicted. The result shows that the interfacial strength of the glass fiber bundle is higher than that of the carbon fiber bundle in transverse direction. By using the interfacial strength and according to the Von Mises yielding criterion, the initial fracture stress was predicted, which can be a contribution to the design or predict of the material properties.