Simulation of the thermostamping of woven composites: determination of the tensile and in-plane shearing behaviors
Simulation of the thermostamping of woven composites: determination of the tensile and in-plane shearing behaviors
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机织复合材料的热冲压模拟：拉伸和面内剪切行为的测定
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Julie Chen
中科院分区：
文献类型：
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作者：
D. Jauffrès;C. Morris;J. Sherwood;Julie Chen
织物增强热塑性复合材料热冲压过程的数值模拟需要准确表征织物材料的性能。为了捕捉构成机织织物的纱线与基体的热塑性树脂的相互作用，这些热塑性复合材料的表征过程需要拉伸和剪切测试。本文介绍了三种Twintex®织物的实验研究，这些织物被描述为国际基准计划的一部分。拉伸刚度是通过单根纱线的单轴拉伸试验确定的。在室温和175°C的剪切框架试验中表征了面内剪切行为。这些Twintex织物的剪切框架测试已被发现对测试方法非常敏感，从使用不同测试设置的各个研究小组的剪切框架测试数据的巨大差异可以证明这一点。对不同的方法进行了回顾，以达到对测试的理解。讨论了不确定性的可能来源，并根据这一分析，提出了一种适当的测试方法，特别是使用机械调节方法。三维数字图像相关（DIC）用于测量应变场，评估实际剪切角和试样内部剪切的均匀性。
The numerical simulation of the thermostamping process for fabric-reinforced thermoplastic composites requires an accurate characterization of the fabric material properties. To capture the interaction of the yarns comprising the woven fabric and the thermoplastic resin of the matrix, the characterization process of these thermoplastic composites requires tensile and shear tests. In this paper, the experimental investigation of three Twintex® fabrics which are being characterized as part of an international benchmark program is presented. The tensile stiffness is determined by unaxial tensile tests of single yarns. The in-plane shear behaviour is characterized by shear-frame tests at room temperature and at 175°C. Shear-frame testing of these Twintex fabrics has been found to be very sensitive to the test methodology as evidenced by the large discrepancy for shear-frame test data from the various research groups using different testing setups. The different methods are reviewed to achieve an understanding of the test. The possible sources of uncertainties are discussed, and in light of this analysis, an appropriate test, using in particular a mechanical conditioning method, is proposed. Three-dimensional Digital Image Correlation (DIC) is used to measure the strain field and to evaluate the actual shear angle and the homogeneity of the shearing within the specimen.