公开(公告)号：US3969930A

公开(公告)日：1976-07-20

申请号：US567144

申请日：1975-04-10

申请人： Dusan Ciril Prevorsek ,  Young Doo Kwon ,  Raj Kumar Sharma ,  Edward T. Gilliam

发明人： Dusan Ciril Prevorsek ,  Young Doo Kwon ,  Raj Kumar Sharma ,  Edward T. Gilliam

IPC分类号： G01N19/00 ,  G01N3/34

CPC分类号： G01N3/34 ,  G01N2203/0016 ,  G01N2203/0071 ,  G01N2203/0094 ,  G01N2203/0226

摘要： An apparatus and method for testing viscoelastic solids, such as tire cord. The apparatus includes: a holding means, a pretension means, a displacement generator, and a mechanical-electrical transforming means. The holding means holds the material in a predetermined position. The pretension means applies tension during testing. The displacement generator has an eccentric means for applying cyclic displacement. The mechanical-electrical transforming means transforms mechanical motion into electrical signals, such as a stress signal, a strain signal and a differentiated strain signal. There is a phase lag between the stress signal and the strain signal and the phase lag may vary in amount and direction as a function of time. The apparatus may also include: an integrating means for integration of a stress-strain hysteresis loop; and a display means for displaying an output of the integrating means to measure the area of the hysteresis loop and thereby determine energy loss. The method includes: applying strain to the material, with resulting stress developed in the material; transforming the strain into an electrical strain signal having a strain wave form; transforming the resulting stress into an electrical stress signal having a stress wave form; controlling the strain to produce a substantially sinusoidal strain wave form representing strain; and allowing the stress to produce a stress wave form representing stress which may be non-sinusoidal or sinusoidal.

摘要翻译： 用于测试粘弹性固体的装置和方法，例如轮胎帘线。 该装置包括：保持装置，预张紧装置，位移发生器和机械电转换装置。 保持装置将材料保持在预定的位置。 预张力在测试过程中施加张力。 位移发生器具有用于施加循环位移的偏心装置。 机电变换装置将机械运动转换成电信号，例如应力信号，应变信号和微分应变信号。 在应力信号和应变信号之间存在相位滞后，并且相位滞后可以随着时间的变化而在量和方向上变化。 该装置还可以包括：积分装置，用于积分应力 - 应变磁滞回线; 以及显示装置，用于显示积分装置的输出以测量磁滞回线的面积，从而确定能量损失。 该方法包括：对材料施加应变，产生在材料中产生的应力; 将应变变换为具有应变波形的电应变信号; 将产生的应力变换为具有应力波形的电应力信号; 控制应变以产生表示应变的基本上正弦的应变波形; 并且允许应力产生表示可能是非正弦曲线或正弦曲线的应力的应力波形。