基于ANSYS Workbench的剪式升降平台有限元分析

通过建立剪式升降平台的三维模型,利用ANSYS Workbench对其进行有限元分析,得到升降平台起动时刻的Von—Mises应力;并根据理论知识对结构进行强度校核。结果显示,剪式升降平台在工作过程中的强度满足要求。     

温度荷载对裂纹扩展的影响

基于线弹性断裂力学，采用平面应变有限单元法，应用MSC NASTRANY有限元软件对含有裂缝的半刚性基层沥青混凝土路面在温度荷载作用下的应力状况进行了初步分析，得到了不同参数情形下的裂尖应力强度因子，研究结果对沥青路面结构设计具有一定的参考价值。     

T形截面钢骨混凝土柱延性性能分析

利用大型有限元分析软件ABAQUS分析了T形截面钢骨混凝土柱在低周反复荷载作用下的受力性能,综合钢骨混凝土柱现有的试验研究成果,研究了T形截面钢骨混凝土柱在不同轴压比系数、配钢率、混凝土强度等级和长细比等参数对其延性的影响,得出了T形截面钢骨混凝土柱具有很好的延性性能,并提出了不同参数影响下T形截面钢骨混凝土柱满足一定延性要求的轴压比限值。     

巷道用自移式辅助支护设备顶梁的优化及有限元分析

巷道用自移式辅助支护设备是一种新型的井下临时支护设备。它与掘进机配套使用,主要用于对掘进工作面的临时支护,保证掘进机的连续作业,实现机掘巷道临时支护的机械化作业。临时支护要求设施体积小、重量轻,结构简单,机械加工简单。对主要承载部件—顶梁进行了结构优化和有限元分析。     

三缸单作用柱塞泵曲轴的理论分析与强度计算

介绍将力学和有限元分析相结合进行三缸单作用柱塞泵曲轴强度分析的方法。以某型柱塞泵曲轴为例阐述力学分析和有限元分析的过程。与传统的力学方法相比较,该方法不需要编制复杂的程序。提高了效率和准确度。可用于其它类曲轴等较为复杂的零件强度分析。     

大型箱梁翼缘开洞有限元分析

应用有限元法分析了大型双腹箱形开洞梁，以孔洞宽度和位置为变量，探讨孔洞对梁的应力、应变及跨中挠度的影响规律．研究结果表明，随着洞位置向跨中移动，以及洞宽度的增大，跨中挠度增大较快．当孔洞与支座的距离大于0．3倍跨度时，跨中最大正应力会突然减小，但小于0．3倍跨度时，开洞对跨中最大正应力影响不大．随着孔洞断面宽度的增大，开洞断面下翼缘正应力逐渐增大，与材料力学计算结果差异越来越大，但该断面的剪应力却与材料力学计算值较为接近．最后，比较有限元计算值与材料力学计算值，得出修正系数供设计参考．     

Biomechanical properties of single chondrocytes and chondrons determined by micromanipulation and finite-element modelling

A chondrocyte and its surrounding pericellular matrix (PCM) are defined as a chondron. Single chondrocytes and chondrons isolated from bovine articular cartilage were compressed by micromanipulation between two parallel surfaces in order to investigate their biomechanical properties and to discover the mechanical significance of the PCM. The force imposed on the cells was measured directly during compression to various deformations and then holding. When the nominal strain at the end of compression was 50 per cent, force relaxation showed that the cells were viscoelastic, but this viscoelasticity was generally insignificant when the nominal strain was 30 per cent or lower. The viscoelastic behaviour might be due to the mechanical response of the cell cytoskeleton and/or nucleus at higher deformations. A finite-element analysis was applied to simulate the experimental force-displacement/time data and to obtain mechanical property parameters of the chondrocytes and chondrons. Because of the large strains in the cells, a nonlinear elastic model was used for simulations of compression to 30 per cent nominal strain and a nonlinear viscoelastic model for 50 per cent. The elastic model yielded a Young''s modulus of 14 ± 1 kPa (mean ± s.e.) for chondrocytes and 19 ± 2 kPa for chondrons, respectively. The viscoelastic model generated an instantaneous elastic modulus of 21 ± 3 and 27 ± 4 kPa, a long-term modulus of 9.3 ± 0.8 and 12 ± 1 kPa and an apparent viscosity of 2.8 ± 0.5 and 3.4 ± 0.6 kPa s for chondrocytes and chondrons, respectively. It was concluded that chondrons were generally stiffer and showed less viscoelastic behaviour than chondrocytes, and that the PCM significantly influenced the mechanical properties of the cells.     

Mathematical Modeling of Stress Fields for the Problems of Prospecting and Mining the Hydrocarbon Deposits

The possibility of predicting the reservoir rock location is shown on the basis of finite-element modeling of the volume stress-strain state of rock mass. To increase the calculation accuracy, this method procedure is improved with regard for the conjugation conditions of the stress field components at the interfaces.     

拉—压杆模型法在牛腿配筋设计中的应用

钢筋混凝土结构构件的设计一般采用截面内力法进行受力分析，然后采用经验公式进行配筋设计。国际上比较常用的方法是应用拉-压杆模型法进行结构构件的配筋设计。本文以钢筋混凝土短牛腿为例，阐述拉-压杆模型的基本原理，同时通过一个设计实例说明拉-压杆模型的建立、设计准则、设计步骤等。     

用振动测量数据最优修正质量矩阵

在实际工程中，由有限元模型得到的计算值与通过试验获得的测量值之间往往存在偏差，为了能够精确预测结构的动力响应，依据测量信息修正存在的动力模型是非常必要的。运用代数特征值反问题的理论和方法，研究了满足正交性条件的质量矩阵的修正问题，得到了Frobenius范数意义下的最优修正矩阵。