EFFECT OF THERMAL RESIDUAL STRESS ON THE INTERLAMINAR CRACK EXTENSION BEHAVIOR IN CROSS-PLY LAMINATES DUE TO TRANSVERSE LOADING

This paper focuses on the reduction of process-related thermal residual stress in fiber metal laminates and its impact on the mechanical properties. Different modifications during fabrication of co-cure bonded steel/carbon epoxy composite hybrid structures were investigated. Specific examinations are conducted on UD-CFRP-Steel specimens, modifying temperature, pressure or using a thermal expansion clamp during manufacturing. The impact of these parameters is then measured on the deflection of asymmetrical specimens or due yield-strength measurements of symmetrical specimens. The tensile strength is recorded to investigate the effect of thermal residual stress on the mechanical properties. Impact tests are performed to determine the influence on resulting damage areas at specific impact energies. The experiments revealed that the investigated modifications during processing of UD-CFRP-Steel specimens can significantly lower the thermal residual stress and thereby improve the tensile strength.

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Effect of thermal residual stress on the reflection spectrum from FBG sensors embedded in CFRP composites

10.1117/12.470709 ◽

2002 ◽

Cited By ~ 1

Author(s):

Yoji Okabe ◽

Shigeki Yashiro ◽

Ryohei Tsuji ◽

Tadahito Mizutani ◽

Nobuo Takeda

Keyword(s):

Residual Stress ◽

Reflection Spectrum ◽

Thermal Residual Stress ◽

Cfrp Composites ◽

Fbg Sensors

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Micromechanical Modeling of Viscoplastic Behavior of Laminated Polymer Composites With Thermal Residual Stress Effect

Journal of Engineering Materials and Technology ◽

10.1115/1.4033070 ◽

2016 ◽

Vol 138 (3) ◽

Cited By ~ 9

Author(s):

Qiang Chen ◽

Xuefeng Chen ◽

Zhi Zhai ◽

Xiaojun Zhu ◽

Zhibo Yang

Keyword(s):

Residual Stress ◽

Polymer Matrix Composites ◽

Micromechanical Model ◽

Thermal Residual Stress ◽

Micromechanical Modeling ◽

Multiscale Approach ◽

Stress Effect ◽

Accurate Analysis ◽

Rate Dependent ◽

Residual Stress Effect

In this paper, a multiscale approach has been developed for investigating the rate-dependent viscoplastic behavior of polymer matrix composites (PMCs) with thermal residual stress effect. The finite-volume direct averaging micromechanics (FVDAM), which effectively predicts nonlinear response of unidirectional fiber reinforced composites, is incorporated with improved Bodner–Partom model to describe the viscoplastic behavior of PMCs. The new micromechanical model is then implemented into the classical laminate theory, enabling efficient and accurate analysis of multidirectional PMCs. The proposed multiscale theory not only predicts effective thermomechanical viscoplastic response of PMCs but also provides local fluctuations of fields within composite microstructures. The deformation behaviors of several unidirectional and multidirectional PMCs with various fiber configurations are extensively simulated at different strain rates, which show a good agreement with the experimental data found from the literature. Influence of thermal residual stress on the viscoplastic behavior of PMCs is closely related to fiber orientation. In addition, the thermal residual stress effect cannot be neglected in order to accurately describe the rate-dependent viscoplastic behavior of PMCs.

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