摘要：Slender chiral filaments are ubiquitous in both artificial and biological *** to their chiral microstructures,chiral filaments usually exhibit favorable properties such as superior elasticity and unusual stretch-twist coupling ***,how these chiral microstructures affect the elastic behavior of filaments remains *** this paper,a refined Cosserat rod model with misfit or mismatching of chirality induced by inhomogeneous arrangement of chiral microstructures incorporated is *** the refined rod model,the force-displacement relationships and variation of structural chirality during the tensile processes of two typical helical structures,i.e.,single-strand helix and double-strand helix,are *** results show that the misfit of chirality can lead to a bend-twist deformation with a high coupling degree,which makes the rod much“soft”when *** chiral filaments undergo an unusual twist when stretched,corresponding to an obviously nonlinear variation of structural *** work suggests that the misfit of chirality can be used to tune the elastic behavior of chiral filaments,which is helpful in guiding the design of flexible actuators and soft devices.

摘要：本文尝试应用有限元分析软件ANSYS workbench,对镁合金车轮进行弯曲疲劳仿真分析,找到该车轮上应力最大的点即危险点和该点上相对应的应力值,利用所得应力值与名义应力法对车轮的寿命进行预测,并将得到的结果与通过软件分析所得结果进行比较;对车轮的其他动态特性进行分析,再将分析结果与铝制车轮进行对比,研究结果提出了车轮合理设计的发展方向。

摘要：为了解决数字化仪控设备在设计阶段无法规避其潜在故障模式,传统研制试验方法无法模拟设备在全寿命周期内的环境剖面和任务剖面,以及在研制阶段无法暴露设备部分故障模式的问题,提出对适应性精简后的某型数字化仪控设备开展高加速极限试验(HALT)试验,并借鉴国外大量类似试验的统计结果和设备环境适应性要求制定了衡量故障改进必要性的应力水平范围判据;同时结合相似仪控设备应用经验反馈对试验方案进行了调整;最后结合目标设备已有的机内测试(BIT)检测手段配套开发了实时状态监测和故障分析工具,配套完成试验开展过程中的实时监测和辅助失效分析。试验结果表明,定制化调整后的试验方法可有效地暴露和复现该典型数字化仪控设备的潜在故障,可操作性较强,可应用于其他相似的仪控设备。