Strength of Hygrothermally Conditioned Polymer Composites with Voids

Costa, Mirco; Rezende, Mirabel Cerqueira; Almeida, Sérgio Frascino Müller de

doi:10.1177/0021998305051807

Cited by 66 publications

(73 citation statements)

References 22 publications

(52 reference statements)

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“…Damage evolution of the aged specimen was primarily caused by the debonding of the fiber/matrix inter-face. Voids could potentially amplify the effects of moisture absorption in the laminate, and introduce high stress concentrations that facilitate the development of microcracks [9]. Moisture absorption accelerates the damage propagation in the composite.…”

Section: Mechanical Testsmentioning

confidence: 99%

“…A compressive test is principally driven by the behavior of the resin and the fiber/matrix interfaces, especially in hygrothermal aging conditions. Costa et al [9] indicated that the water absorbed by the laminates causes either reversible or irreversible plasticization of the matrix. Combined with the temperature effects, these factors may cause significant changes in the matrix toughness, affecting the laminate strength.…”

Section: Compressive Strength Testmentioning

confidence: 99%

“…Water absorption and its resulting effects contribute to the loss of compatibility between the fibers and matrix, which resulted in debonding and weakening of the interfacial adhesion [16]. The interface and the effects of environmental conditions on its strength play a major role in determining the strength of composite laminates in the presence of moisture [9]. Figure 7 illustrates that the damage of the tensile side of the aged failed bending specimens was more severe than that of the compressive side.…”

Section: Bending Strength Testmentioning

confidence: 99%

“…Moisture absorption and high temperature cause plasticization of the matrix which changes its toughness. Moreover, humidity and temperature cause dimensional changes and induce stresses in the laminate that degrade the fiber/ matrix interface [9]. The ILSS test is principally driven by the behavior of the resin and the fiber/ matrix interfaces, which are particularly affected by hygrothermal aging.…”

Section: Ilss Testmentioning

confidence: 99%

“…Long-term exposure at high temperatures is also a concern for CFRP, as higher temperatures accelerate diffusion rates of moisture and generally accelerate aging [7,8]. Costa et al [3,9] indicated that voids in polymer matrix composites may result in significant reductions in matrix dominated mechanical properties such as interlaminar shear, compressive, and flexural strengths. Voids affect the same mechanical properties affected by environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Zhang¹,

Li²,

Zhang³

et al. 2011

Express Polym. Lett.

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Abstract. The paper investigates the effect of voids and hygrothermal conditions on bending, compressive, and interlaminar shear strength (ILSS) of T300/914 composite laminates. By adopting different autoclave pressures during a cure cycle, specimens with three different void contents ranging from 0.33% to 1.50% were obtained. Experimental results reveal that compressive, bending strength, and ILSS decrease with increasing void contents and immersion time. The most significant decrease in strength of aged specimens is in the ILSS and compressive strength, followed by the bending strength. The effect of voids on the absorption/desorption behavior is also discussed. For a similar porosity, the compressive strength and ILSS of dried specimens are higher than that of the aged specimens, while they are lower than that of the unaged specimens. The bending strength of the dried specimens is higher than that of the unaged specimens. The experimental results are explained by the supportive micrographs that illustrate different types of voids and their morphology before and after moisture absorption/desorption.

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Section: Mechanical Testsmentioning

confidence: 99%

Section: Compressive Strength Testmentioning

confidence: 99%

Section: Bending Strength Testmentioning

confidence: 99%

Section: Ilss Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Zhang¹,

Li²,

Zhang³

et al. 2011

Express Polym. Lett.

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Effects of postcure temperature variation on hygrothermal‐mechanical properties of an out‐of‐autoclave polymer composite

Vora

Minaie

2013

J of Applied Polymer Sci

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The effects of cure temperature variation on the properties of an out-of-autoclave polymer composite manufactured using Cycom 5320 8HS prepreg were investigated using different postcure temperatures of a two-stage cure cycle. In addition, the effects of adverse environmental conditions on the cure temperature variation were studied by conditioning the samples in an environmental chamber until they reached moisture equilibrium. The state of cure was obtained using a differential scanning calorimeter and dynamic mechanical analyzer. The mechanical properties were obtained using short-beam shear (SBS) and combined loading compression (CLC) test methods. The state of cure obtained showed increases in total heat of reaction, degree of cure, and glass transition temperature as the postcure temperature increased. The SBS and CLC strengths showed an increasing trend as postcure temperature increased. Good correlations were obtained between the material's cure temperatures, state of cure, and mechanical properties for room temperature dry and hot wet conditions. The study showed that the state of cure can be used to define, monitor, and verify the cure quality.

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Research on the mechanical properties prediction of carbon/epoxy composite laminates with different void contents

Zhang

2014

Polymer Composites

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The influence of the porosity on the static mechanical strength of the carbon fiber fabric reinforced epoxy composites laminates was investigated. The tensile, compressive, bending, and interlaminar strength test on the CFRP laminates with porosity of 0.33% and 1.50% were conducted and simulated by a finite element analysis model. The article proposes the failure criterion of the static mechanical strength of the fabric fiber reinforced composites based on the improved Hashin failure criterion that is suitable for the undirectional composite laminates. The basic composite strength parameters are used to evaluate the mechanical properties of CFRP laminates with different porosities. A finite element analysis model is established by using software ABAQUS TM combined with the sudden stiffness degradation model. The experiment results show that the tensile, compressive, bending, and interlaminar strength decrease with the increasing porosities. The tensile, compressive, bending, and interlaminar strength of the fabric carbon fiber reinforced epoxy composites laminates are simulated accurately by the finite element model. POLYM. COMPOS.,

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Strength of Hygrothermally Conditioned Polymer Composites with Voids

Cited by 66 publications

References 22 publications

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Qualitative separation of the effect of voids on the static mechanical properties of hygrothermally conditioned carbon/epoxy composites

Effects of postcure temperature variation on hygrothermal‐mechanical properties of an out‐of‐autoclave polymer composite

Research on the mechanical properties prediction of carbon/epoxy composite laminates with different void contents

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