The as-molded PDO specimens exposed to PBS overnight had a yield strength reduction of 11.5%, an elastic modulus reduction of 18.6%, and an elongation increase of 3.5%; compared with dry condition test results.

For this material the value at this peak is approximately 0.07 based on a viscous modulus of 40 ksi and an elastic modulus of 570 ksi.

Mechanical Properties of Concrete Specimens with Different Fiber Length Tensile Compressive Elastic Modulus Norm 2,425 32,89 48051,05 Fr1 2,475 29,754 35995,5 Fr2 2,22 23,164 41159 Fr3 2,439 31,366 29545,5 Note: Table made from bar graph.

Figures 9 and 10 show the elastic modulus, G', for compounds created from NR with 2 and 10 minutes of mastication, respectively.

With the precipitation of pyrolysis products, oil shale gradually becomes porous, which causes its physical and mechanical parameters (such as the elastic modulus) to change.

(2) As the temperatures increases, the ultimate stress and strain decline nonlinearly, and the elastic modulus of the material decreases obviously.

Parameters such as elastic modulus and Poisson's ratio of coal and proppant are provided by Daqing oilfield, and the experimental parameters are shown in Table 1.

Due to the relatively big ultimate strain of BFRP reinforcements, the force level of BFPR reinforcements in SCB would be smaller than that of CFPR reinforcements in SCC when similar strains were applied to these FRP reinforcements, as illustrated in (7), in which [F.sub.f] refers to the force level of the FPR reinforcement, [E.sub.f] refers to the elastic modulus of the FRP reinforcement, and [A.sub.f] and [A.sub.eqf] refer to the actual and equivalent cross-section area of the FPR reinforcement.

Influence on Launch Effect of the Elastic Modulus of Concrete Surface Layer.

For the convenience of analysis, the data in Table 2 are plotted as a curve of elastic modulus and cycles, as shown in Figure 6.