Abstract:Damaging of composite laminates was monitored during fatigue tests, revealing the formation and propagation stages for compressive, tensile, or alternate cyclic loading. Two different laminate stacking sequences, with different number of layers, were tested. The laminates consisted of E-glass fibers reinforced orthoftalic polyester resin (FGRP) shaped as mats or (bi-direction) woven fabric textile. Preliminary density, calcination tests and static compressive and tensile mechanical tests were carried out. Then… Show more
“…It also exhibited the phenomenon of fiber pull-out (debonding fiber/matrix interface) in the final region of the fracture, a characteristic damage in fabric-based polymer composites. 1 It is important to remember that this fiber pull-out becomes noticeable after the removal of the test specimens from the clamps of the testing machine. Figure 6.Final fracture region – FC 0/90°.…”
Section: Resultsmentioning
confidence: 99%
“…Composite materials and glass fiberreinforced plastics (GFRP) especially have had an important place in such investigations, as they meet the above-mentioned requirements well, further adding to the advantage of having low weight and, principally, low cost, the essential parameters in many structural applications. 1 The mechanical response of composite materials depends on a range of factors including the nature of its components, i.e., types of reinforcement and matrix, the percentage of its components, as well as fiber distribution and orientation with respect to load application direction. In this sense, the degree of anisotropy is an important factor to be assessed in these materials.…”
Section: Introductionmentioning
confidence: 99%
“…Composite materials and glass fiber-reinforced plastics (GFRP) especially have had an important place in such investigations, as they meet the above-mentioned requirements well, further adding to the advantage of having low weight and, principally, low cost, the essential parameters in many structural applications. 1…”
This research aims to analyze a study of the mechanical response, in the presence of geometric discontinuity, of glass fiber-reinforced plastics to the uniaxial tensile test. Geometric discontinuity is characterized by a circular hole in the longitudinal section (with reduction of the cross-section) of the composite. In this study, different configuration types are tested, with and without hole, to provide a better understanding of the mechanical properties, with respect to residual strength, anisotropy, and fracture characteristics. The residual strength determined using the precepts given by the ASTM D 5766-07 standard is used in the point-stress criterion and average-stress criterion failure theories for the semiempirical calculation of the distances (d 0 and a 0 ) in the vicinity of the hole, the region where stress failure occurs. Semi-empirical distances are determined for the composite laminate whose configuration is considered isotropic. The results show the direct influence of the presence of geometric discontinuity and residual strength in all the parameters studied, in addition to fracture characteristics.
“…It also exhibited the phenomenon of fiber pull-out (debonding fiber/matrix interface) in the final region of the fracture, a characteristic damage in fabric-based polymer composites. 1 It is important to remember that this fiber pull-out becomes noticeable after the removal of the test specimens from the clamps of the testing machine. Figure 6.Final fracture region – FC 0/90°.…”
Section: Resultsmentioning
confidence: 99%
“…Composite materials and glass fiberreinforced plastics (GFRP) especially have had an important place in such investigations, as they meet the above-mentioned requirements well, further adding to the advantage of having low weight and, principally, low cost, the essential parameters in many structural applications. 1 The mechanical response of composite materials depends on a range of factors including the nature of its components, i.e., types of reinforcement and matrix, the percentage of its components, as well as fiber distribution and orientation with respect to load application direction. In this sense, the degree of anisotropy is an important factor to be assessed in these materials.…”
Section: Introductionmentioning
confidence: 99%
“…Composite materials and glass fiber-reinforced plastics (GFRP) especially have had an important place in such investigations, as they meet the above-mentioned requirements well, further adding to the advantage of having low weight and, principally, low cost, the essential parameters in many structural applications. 1…”
This research aims to analyze a study of the mechanical response, in the presence of geometric discontinuity, of glass fiber-reinforced plastics to the uniaxial tensile test. Geometric discontinuity is characterized by a circular hole in the longitudinal section (with reduction of the cross-section) of the composite. In this study, different configuration types are tested, with and without hole, to provide a better understanding of the mechanical properties, with respect to residual strength, anisotropy, and fracture characteristics. The residual strength determined using the precepts given by the ASTM D 5766-07 standard is used in the point-stress criterion and average-stress criterion failure theories for the semiempirical calculation of the distances (d 0 and a 0 ) in the vicinity of the hole, the region where stress failure occurs. Semi-empirical distances are determined for the composite laminate whose configuration is considered isotropic. The results show the direct influence of the presence of geometric discontinuity and residual strength in all the parameters studied, in addition to fracture characteristics.
“…It is important to highlight that the presence of fibers with different mechanical and physical properties in a composite laminate may cause high dispersions when compared to laminates reinforced with a single fiber type, primarily in the case of synthetic fibers 1,22 . All dispersions on this paper are characterized by the absolute difference between the maximum and minimum values found in the tests.…”
This study aimed to analyze the mechanical properties and damage characteristics in uniaxial tensile loading of two hybrid composite laminates consisting of an ortho-therephthalic polyester matrix reinforced by bidirectional jute fabrics and E-glass fibers, with different configurations and types of geometric discontinuities in the longitudinal section, characterized by the presence of a circular hole and semicircular notches. A semi-empirical study was conducted using the residual properties obtained in mechanical tests, as well as the Point Stress Criterion (PSC) and Average Stress Criterion (ASC) failure theories. This study is based on the calculation of distances (d 0 and a 0) in the neighborhood of both the hole and the notches, the area of failure stress. The results show the direct influence of geometric discontinuity and residual and modulus strengths in all the parameters studied. With respect to failure theories, only the PSC showed good agreement when the K equal to 2.36 or 2.58 values was used.
“…Freire [11] investigated the damage mechanism and fracture prevention in Eglass polyester resin composites, his woke was limited to bidirectional and stacked bidirectional woven fabric textile. Husain [12] studied composite materials formulated by stacking four layers of fiber glass indifferent angle orientations immersed in polyester resin.…”
In this work polymeric composites were done from unsaturated polyester as a matrix reinforced with glass fiber type (E-glass) with two different volume fraction 20% & 40%. Fatigue tests showed that the number of fatigue cycles to failure limit for samples reinforced with uniform (woven Roving 0-90°) E-glass fiber and random (continuous fibers) with volume fraction 40% more than that for the same samples with volume fraction 20%. Also the fatigue results showed that the uniform samples failed with fatigue cycles more than that of random.
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