ABSTRACT

The problem of typical stress-based fatigue assessment methods is that additional influencing factors like temperature effects do not directly influence the respective stress and can thus only be incorporated via modification factors. The stress averaging approach is expected to account for effects that influence the support around notches via the micro-structural support length ρ*. This study thus investigates the applicability of the stress averaging approach for welded joints in engineering structures exposed to sub-zero temperatures. For this purpose, fatigue test results of welded joints in the temperature range of 20°C down to −50°C are assessed. It is shown that it is possible to assess data for different temperature with the same reference fatigue curve while maintaining a small scatter without the need for modification factors.

摘要

典型的基于应力的疲劳评估方法的问题是温度效应等附加影响因素不会直接影响相应的应力，因此只能通过修改因素来合并。应力平均方法预计会通过微结构支撑长度ρ来解释影响槽口周围支撑的影响*. 因此，本研究调查了应力平均方法在暴露于零以下温度的工程结构中焊接接头的适用性。为此，评估了焊接接头在 20°C 至 -50°C 温度范围内的疲劳试验结果。结果表明，可以使用相同的参考疲劳曲线评估不同温度下的数据，同时保持较小的分散，而无需修改因子。