Which of the following expressions represents the rate of work done by the stresses during the deformation of a body of an arbitrary material?

位逻辑指令 定时器与计数器指令 数据处理指令 程序控制指令

1 梯形图 2 语句表 3 逻辑功能图 4 数据类型 5 寻址方式

1.PLC的基本组成 2.各个部分的作用 3 PLC控制原理

The following stress-strain curves were obtained for dif- ferent materials subjecting the specimen to the loading path(a, b, c, d ). Which one(s) of them correspond to elas- tic material(s)

Extend definition to material bodies: total work is the addition of the work done on all particles by forces distributed over the volume W by forces distributed over the surface t·udS

Which of the following expressions most ac curately and simply represents the comple mentary strain energy density Uc of a linear elastic material?

For the uniform state of plane strain shown in the fig ure,which one(s) of the following statement(s) is(are valid?(Assume Poisson's ratio v+0)

Unit #9 -Calculus of Variations Let u be the actual configuration of a structure or mechanical system. u satisfies the displacement boundary conditions: u=u* on Su. Define

Principle of Virtual Displacements Consider a body in equilibrium. We know that the stress field must satisfy the differential equations of equilibrium. Multiply the differential equations of equilibrium by an \arbitrary\displacement field T