因此，无磁杜瓦在使用过程中反复冷却及复温所产生的循环应力载荷，是导致其真空性能下降的一个重要原因。
Therefore, the cyclic stress caused by repeatedly cooling and heating during the usage of non-magnetic Dewar is one of the important reasons that causes the decrease of vacuum performance.
试验结果表明，玻璃纤维长丝纱有较明显的应力松驰现象，反复循环负荷作用对玻璃纤维长丝纱的强伸性能有较大的影响。
As a result, the stress-relaxation of yarn is obviously observed, and the cyclic loading has much more influence on the tensile property of yarn.
降低了的梁内纵筋的应力能在反复循环荷载下获得较为有利的粘结条件，特别是在缺少柱上轴向压力的时候。
The reduced stresses in the longitudinal bars help to achieve less critical bond condition under the cyclic loading, especially in the lack of column axial force.
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