This article made a systematic study for measuring methods of extensional wave velocities using flexural and longitudinal resonance vibrations, and improved traditional measuring equipment arrangement of longitudinal resonance vibration.

Effect of tensile rate on mechanical properties of NEPE propellant;

The effect of tensile rate on the lower yield strength of the iron and steel material was investigated,the advantage of the tensile rate of GB/T228-2002 was discussed.

The effects of particle volume fraction, tensile rate and interface bonding strength on the properties of GB/HDPE composites were studied by tensile test and SEM observation.

Effect about the stretching speed and other parameters to fiber bundle slenderizing processing;

The effects of stretching speed change and different speed changing positions on the m value determined were discussed.

By using the tester for internal friction based on the Ke's inverted torsion pendulum, the effect of the tensile rate on the alloy grain boundary internal friction in Al-0.

Uniaxial extension tests of ethylene tetrafluoroethylene(ETFE) foil specimens(thickness: 250 μm) were carried out by using six kinds of extension speed(tensile strain rate: 10(%/min),25%/min,50%/min,100%/min,200%/min,500%/min).

Because low working accuracy,improper tensile speed,and loose grip force for sample the measuring error of steel tube tensile test is large in Lubao steel tube plant.