Energy-based approaches are adopted in fatigue analysis of materials, components and structures. Several methods consider the thermal energy, which results from energy conversion of the mechanical energy expended by applying cyclic fatigue loadings. By exploiting the self-heating phenomenon, the specific heat energy can be measured during laboratory fatigue tests in a rather simple and efficient way. In previous papers, the specific heat loss has been adopted to correlate fatigue test data relevant to pure axial and pure torsional fatigue loadings. In this paper, it is adopted to correlate successfully the fatigue test data generated under in-phase and out-of-phase axial/torsional multiaxial fatigue loadings.

在材料、部件和结构的疲劳分析中采用基于能量的方法。有几种方法考虑了热能，热能是通过施加循环疲劳载荷消耗的机械能的能量转换产生的。通过利用自热现象，可以在实验室疲劳试验中以一种相当简单有效的方式测量比热能。在以前的论文中，已采用比热损失来关联与纯轴向和纯扭转疲劳载荷相关的疲劳测试数据。在本文中，成功地关联了在同相和异相轴向/扭转多轴疲劳载荷下产生的疲劳试验数据。