The effects of unequal compressive/tensile moduli of composites

Meng, Maozhou; Le, Huirong; Rizvi, M.J.; Grove, Stephen

doi:10.1016/j.compstruct.2015.02.064

Cited by 46 publications

(28 citation statements)

References 22 publications

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“…Pseudo‐ductility effects of angle‐ply laminates have been analyzed in a limited number of studies under tensile loading . However, composite structures are subjected to complicated loading conditions, such as bending, tension, compression or twisting . Hence, pseudo‐ductility could also be of great interest in angle‐ply laminates submitted to flexural loading, because tension and compression are applied in different parts of the cross‐sections simultaneously .…”

Section: Introductionmentioning

confidence: 99%

Tensile and flexural damage response of symmetric angle‐ply carbon fiber‐reinforced epoxy laminates: Non‐linear response and effects of thickness and ply‐stacking sequence

et al. 2019

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Advanced fiber reinforced composites have excellent specific strength and stiffness properties, but tend to be limited by linear elastic response and sudden, brittle failure. This lack of ductility greatly limits the structural efficiency of reinforced composite designs. Hence, achieving some non-linear behavior is desirable and it can help composite structures to maintain functionality even when they are overloaded to improve safety and reduce the applied safety factors. The aim of this study is to characterize and assess the effect of laminate thickness and the type of scaling technique on the damage response of symmetric angle-ply carbon fiber-reinforced polymer (CFRP) composite laminates subjected to tensile and flexural loading. This study considers the different behavior of the composite material under tension and compression in order to evaluate their influence on the failure modes. Tensile and three-point bending tests were carried out to determine the mechanical response in terms of strength and stiffness of the different CFRP laminates. Optical micrographs of failed samples were used to assess damage mechanisms of the different configurations. It was observed that non-linear behavior and high strains to failure could be achieved with angle-ply laminates. Furthermore, the maximum flexural strength increased and maximum flexural strain decreased as laminate thickness increased. Finally, the results obtained demonstrate that introducing ply clustering had a negative effect on the mechanical performance and pseudo-ductility exhibited by angle-ply laminates. POLYM. COMPOS., 40:3678-3690, 2019. FIG. 8. Average flexural stress-strain curves of the angle-ply samples and cross-sectional micrographs of the failed regions. (a) Average flexural stress-strain curves for the sublaminate angle-ply samples as a function of the laminate thickness. (b) Average flexural stress-strain curves for the ply-level angle-ply samples as a function of the laminate thickness. (c) Comparative of average flexural stress-strain curves as a function of the type of scaling. [Color figure can be viewed at wileyonlinelibrary.com]

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Section: Introductionmentioning

confidence: 99%

Tensile and flexural damage response of symmetric angle‐ply carbon fiber‐reinforced epoxy laminates: Non‐linear response and effects of thickness and ply‐stacking sequence

et al. 2019

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“…Bos et al [ 21 ] found that flax fiber has a high compression-to-tensile ratio of 80% in the loop test. Meng et al [ 22 ] found the average ratio of tensile to compressive modulus is 0.9 due to misalignment of fiber and production problems (porosity content). In addition, the inclination angle of fiber was measured using an indirect method and the inclination angle distribution of fiber was given.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Tensile and Compressive Properties of Carbon/Glass Interlayer and Intralayer Hybrid Composites

Wang

2018

Materials

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Tensile and compressive properties of interlayer and intralayer hybrid composites were investigated in this paper. The tensile modulus and compression modulus of interlayer and intralayer hybrid composites are the same under the same mixed ratio, the tensile strength is much superior to the compression strength, and while the tensile modulus and strength increase along with the carbon fiber content, the compression values change slightly. The influence of stacking structures on the tensile and compressive strengths is opposite to the ratio of T/C (tensile/compression) strength for interlayer hybrid composites, and while the tensile and compression strengths with glass fiber sandwiching carbon fiber can reach the maximum value, the ratio of T/C strength is minimum. For structures with carbon fiber sandwiching glass fiber, or with asymmetric structures, the tensile and compressive strengths are at a low value. For intralayer hybrid structures, while the carbon/glass (C/G) dispersion degree is high, the tensile and compression strengths are low. The experimental tensile and compressive strengths for interlayer and intralayer hybrid composites are greater than the theoretical values, which demonstrates that strength conforms well to the positive hybrid effect. The tensile fracture strain is greater than the compression fracture strain for hybrid composites, with both of them basically maintained at the same level.

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“…Appling the classical elastic theory to a two simply supported beam deflected at the middle by a vertical load, P, the value of maximum deflection at the middle of the beam, D, can be calculated as; 3 48…”

Section: General Theorymentioning

confidence: 99%

“…These kinds of materials may behave differently in tensile stress and compressive stress. Thus it is necessary to study and investigate the mechanical behavior of materials in different load directions [2][3]. Tensile modulus can be measured relatively easily, however, because of some difficulties such as buckling; it is extremely difficult to measure the direct axial compressive stress.…”

Section: Introductionmentioning

confidence: 99%

Determination of Tensile and Compressive Moduli of Polymer Composites Using Three Points Cantilever

Rahmatpanah¹,

Ghane²,

Rahmatpanah³

2019

AJMIE

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In this work a technique is proposed to use bending test in order to determine the tensile and the compressive moduli of plastic sheets as well as polymer composites. A two-component free ends beam deflected in a three point cantilever is used to determine tensile and compressive moduli. Using small deflection equations and the theory of two-component beam, tensile and compressive moduli are then determined via computer program. The beam is composed of two components; spring steel and polymeric strip of the same width. These two components are bonded together with special glue. Two different types of material sheets were tested. The results show that both materials have different tensile and compressive modulus. To verify the model, uniaxial tensile tests were also performed. Taking the values of uniaxial tensile tests as reference showed acceptable accuracy at the proposed method.

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The effects of unequal compressive/tensile moduli of composites

Cited by 46 publications

References 22 publications

Tensile and flexural damage response of symmetric angle‐ply carbon fiber‐reinforced epoxy laminates: Non‐linear response and effects of thickness and ply‐stacking sequence

Tensile and flexural damage response of symmetric angle‐ply carbon fiber‐reinforced epoxy laminates: Non‐linear response and effects of thickness and ply‐stacking sequence

Comparison of Tensile and Compressive Properties of Carbon/Glass Interlayer and Intralayer Hybrid Composites

Determination of Tensile and Compressive Moduli of Polymer Composites Using Three Points Cantilever

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