in this paper, the flexible spring was introduced and the interation of rigid spring and flexible spring was studied to make the contact of blocks more reasonable andpracticalFinally, the stress, strain and breaking of a bric.

In consideration of the above fact,a constitutive model for the over lean cemented material with the softening characteristics was developed by use of the virtual rigid spring method,and the parameters for the model were determined.

With the engineering example of a V-shaped leg rigid frame arch bridge in the downtown of Luogang in Guangzhou, the force analysis of the bridge is introduced, focusing on calculation of the pile foundation spring rate and the key points for construction.

Based on test conditions with consideration of the nonlinear contact between spring leaves,an accurate finite element model for the fewer-piece leaf spring at both assembling and loading states is built,and the stress distribution and the spring rate of leaf spring,which are close to the real conditions,are obtained through finite element analysis with stress superposition.

This paper introduces the design principle and features of an automatic measuring and sorting system for spring rigidity based on 8031 single-chip microcomputer.

In this paper, step displacement, spring stiffness and time step are discussed through an (example).

Based on the model,an adjusting method for spring stiffness and the damping of shock absorber is put forward,which is then validated through the simulation tests on a SUV.

Experimental tests on friction and wear behavior of copper-impregnated metalized carbon sliding against stainless steel were carried out under the conditions of different spring stiffness,current intensity and sliding velocity on a pin-on-disc tester with electric current,and the friction coefficients,wear rates,and discharge intensity were tested.