stress-strainmodulustensile deformationA new phenomenon has been observed in the tensile deformation of polymers, including polypropylene, poly(ethylene terephthalate) and polyethylene. It has been seen that when draw rate is larger than a critical value, Young's modulus, yield stress and other ...
Graph of maximum stress theory. Quadrant I: biaxial tension; Quadrant II: tension; Quadrant III: biaxial compression; Quadrant IV: compression. It can be seen that uniaxial tension or compression lies on the two axes. Inside the box (outer boundaries) is the elastic range of the material. ...
Photoelastic evaluation is used to make stresses visible in transparent parts. Stressed areas of polymers have refractive characteristics: when subject to stress, transparent materials become "birefringent." Viewed with polarized light, stresses appear as a series of multicolored bands or fringes. This ...
Figure 1. Typical stress-strain graph of ductile low-carbon steels. In other words, beyond theyield point, if the force is released from the object it will experience permanent deformation and no longer return to its original shape. Therefore, the yield point is an approximate estimate of the...
basic material groups (ferrous metals, steels, non-ferrous metals, polymers, elastomers, hard metals, technical ceramics, composite materials). The neutral plane is theoretically defined as the reference plane. As a result of the equality of tensile and compressive stressσret = σrz(Fig.2)...
Mechanics of Elastic Performance of Textile Materials: II. The Application of Sonic Techniques to the Investigation of the Effect of Visco-Elastic Behavior upon Stress-Strain Relationships in Certain High Polymers t 喜欢 0 阅读量: 27 作者: Hamburger,J W.摘要: The factors which affect the textile...
1. To these were added three additional cylinders printed from the same batch of copper powder and using the same print settings to perform mechanical testing. The com- pression tests were performed according to ASTM E9 using a Kudale Tensometer with a nominal strain rate of 0.005 m/m.min,...
The relationship between stress and strain can be plotted on a graph, making a stress–strain curve to form a stress–strain graph (Fig. 2.1.2h). Sign in to download full-size image Fig. 2.1.2h. Ratios of stress to strain on testing can form plots on a graph that demonstrate the ...
In general, it is widely accepted that the yield behavior of polymers is dependent on both the deviatoric and hydrostatic stress components, while the dependence of hydrostatic stress on yielding for metals is significantly less pronounced (20). Based on hydrostatic component of polymer behavior, ...
FIG. 5 is a graph of the stress in films at room temperature as a function of the oxygen concentration during curing of the films. FIG. 6 is a graph of the stress in a PECVD SiCOH film versus time of anneal at 150 C in air. ...