The test data include the stress? Strain curve, yield strength, tensile strength, Youngs modulus, elongation and expansion coefficient.
试验得到的数据有：应力应变关系曲线、屈服强度、极限强度、弹性模量、延伸率和热膨胀系数。
2
It shows that the composites' tensile strength and elongation decrease while the hardness and friction coefficient increase with the addition content of graphite.
In addition, this paper presents how the diameter reducing rate, the die semicone angle, the friction coefficient and the original wall thickness influence the buckling and the axial elongation rate.