论文部分内容阅读
本文用硅铝合金为纤维,618环氧树脂为基体,制成复合材料试件。用电测法研究基体在传力机制中的作用;纤维在断裂过程中的受力变化和核定“失效长度”在微观强度研究中的作用。实验结果表明,当E_f/E_m 较小时,纤维断裂后,离断口远处纤维上的载荷基本上不卸除。在两个断口之间的纤维还可以发生断裂,说明基体在传力机制中具有十分重要的作用,纤维卸荷后还可以增加到超过原来的载荷之最高水平,在离电阻片不同距离处的断口所引起的卸载现象说明失效长度确实是建立力学模型过程中的重要参数。实验还进一步证明复合材料在受力过程中,应变场的不均匀性。实验结果对于分析低模量复合材料的断裂过程和纤维,基体之间力的重新分配提供了不少重要依据。
In this paper, silicon-aluminum alloy fiber, 618 epoxy resin matrix, made of composite materials. Study on the role of matrix in force transmission mechanism by electrical measurement method; Force change of fiber in fracture process and the role of approved “failure length” in the study of microscopic strength. The experimental results show that when E_f / E_m is small, the load on the fibers far away from the fracture is basically not removed after the fiber is broken. The fracture between the two fractures also shows that the matrix plays an important role in the force transmission mechanism. After the unloading, the fiber can also be increased beyond the highest level of the original load, and at a different distance from the resistor The unloading phenomenon caused by fracture shows that the failure length is indeed an important parameter in the process of establishing mechanical model. Experiments also further prove that the composite material in the process of stress, the strain field inhomogeneity. The experimental results provide some important evidences for analyzing the fracture process of low modulus composites and the redistribution of forces between fibers and matrix.