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)

G1 滚动轴承座(表 G8-1) 表 G8-1 二螺柱轴承座(摘自 GB/T 7813—1998)

G1 螺纹 G1.1 普通螺纹的尺寸和公差(表 G4-1)

G1 黑色金属 G1.1 铸铁 G1.1.1 铸铁牌号和性能(表 G3-1)

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

G1 平带传动 G1.1 胶帆布平带 G1.1.1 规格（表 G14-1、表 G14-2）

一、财务风险监测 二、财务危机预警 三、财务预警系统设计与财务预警用途

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