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- 2018
Nylon-230T/TPU织物蒙皮撕裂性能的数值模拟和试验研究
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Abstract:
针对每平方厘米由230根尼龙纱平纹编织并复合热塑性聚氨酯（Nylon-230T/TPU）的织物蒙皮，通过数值模拟和撕裂试验研究了预制裂纹对其撕裂性能的影响，主要包括裂纹长度、裂纹倾斜角度和裂纹位置对蒙皮撕裂强度的影响，通过数字图像相关技术（DIC）获取蒙皮撕裂过程中的应变场，研究了撕裂过程中蒙皮应变场变化规律；分别利用扩展有限元法（XFEM）、内聚力单元法（CZM）及虚拟裂纹闭合技术（VCCT）对预制裂纹Nylon-230T/TPU织物蒙皮的裂纹扩展过程和路径进行了数值模拟，模拟结果与试验结果吻合较好。研究结果表明：Nylon-230T/TPU织物蒙皮的撕裂强度与预制裂纹长度、裂纹倾斜角度及裂纹位置都密切相关；裂纹极大地影响了蒙皮的应变场分布；本文数值模拟方法能够准确预测织物蒙皮裂纹的扩展过程和路径。 The effect of prefabricated crack on the tear properties of plain weave fabric with 230 nylon yarns plain braided per square centimeter and composite thermoplastic polyurethane(Nylon-230T/TPU) was investigated by numerical simulation and tearing test. The effects of crack length, crack angle and crack location on the tear strength of the fabric skin were studied. The strain field of the fabric skin during tearing test process was measured by digital image correlation (DIC) technique. The variation of strain field during tearing process was obtained. The crack propagation process and path of prefabricated cracked Nylon-230T/TPU fabric skin were numerically simulated by using extended finite element method (XFEM), cohesive zone model (CZM) and virtual crack closure technique (VCCT). The validity of numerical simulation is verified by comparison with the experimental results. The results show that the tear strength of Nylon-230T/TPU fabric skin is closely related to the crack length, the crack angle and the crack location. The strain field distribution of Nylon-230T/TPU specimen is greatly affected by the presence of cracks. The numerical simulation results are well agreed with the experimental results. 国家自然科学基金创新群体科学基金（11421091）；中央高校基本科研业务专项资金（HIT.MKSTISP.201609）
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