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Utilization of random process spectral properties for the calculation of fatigue life under combined loading

机译：利用随机过程光谱特性计算复合载荷下的疲劳寿命

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The contribution includes the results of experimental works aiming to find a new methodology for the calculation of fatigue life of structures subjected to operational loading from a combination of forces and moments of random character. Considering the fracture mechanics theory, then the damaging of material is both in the micro- and macro-plastic area connected with the rise of plastic deformation and hence with the plastic transformation rate which depends on the amount of supplied energy. The power spectral density (PSD) indicating the power at individual frequencies in the monitored frequency band yields information about the supplied amount of energy. Therefore, it can be assumed that there is a dependence between the PSD shape and the size of damage and that the supplied power which is proportional to the value of dispersion s^2 under the PSD curve could be a new criterion for the calculation of fatigue life under combined loading. The searching for links between the spectral properties of the loading process and the fatigue life of structure under load is dealt with by new Grant GA No. 101/09/0904 of the Czech Technical University in Prague and the Institute of Thermomechanics of the Academy of Sciences of the Czech Republic, v.v.i. The contribution includes the results of experimental works aiming to find a new methodology for the calculation of life of structures subjected to operational loading from a combination of forces and moments of random character. Considering the fracture mechanics theory, then the damaging of material is both in the micro- and macro-plastic area connected with the rise of plastic deformation and hence with the plastic transformation rate which depends on the amount of supplied energy. The power spectral density (PSD) indicating the power at individual frequencies in the monitored frequency band yields information about the supplied amount of energy. Therefore, it can be assumed that there is a dependence between the PSD shape and the size of damage and that the supplied power which is proportional to the value of dispersion s 2 under the PSD curve could be a new criterion for the calculation of life under combined loading. The searching for links between the spectral properties of the loading process and the life of structure under load is dealt with by new Grant GA No. 101/09/0904 of the Czech Technical University in Prague and the Institute of Thermomechanics of the Academy of Sciences of the Czech Republic, v.v.i. The contribution includes the results of experimental works aiming to find a new methodology for the calculation of fatigue life of structures subjected to operational loading from a combination of forces and moments of random character. Considering the fracture mechanics theory, then the damaging of material is both in the micro- and macro-plastic area connected with the rise of plastic deformation and hence with the plastic transformation rate which depends on the amount of supplied energy. The power spectral density (PSD) indicating the power at individual frequencies in the monitored frequency band yields information about the supplied amount of energy. Therefore, it can be assumed that there is a dependence between the PSD shape and the size of damage and that the supplied power which is proportional to the value of dispersion s 2 under the PSD curve could be a new criterion for the calculation of fatigue life under combined loading. The searching for links between the spectral properties of the loading process and the fatigue life of structure under load is dealt with by new Grant GA No. 101/09/0904 of the Czech Technical University in Prague and the Institute of Thermomechanics of the Academy of Sciences of the Czech Republic, v.v.i. The contribution includes the results of experimental works aiming to find a new methodology for the calculation of fatigue life of structures subjected to operational loading from a combination of forces and moments of random character. Considering the fracture mechanics theory, then the damaging of material is both in the micro- and macro-plastic area connected with the rise of plastic deformation and hence with the plastic transformation rate which depends on the amount of supplied energy. The power spectral density (PSD) indicating the power at individual frequencies in the monitored frequency band yields information about the supplied amount of energy. Therefore, it can be assumed that there is a dependence between the PSD shape and the size of damage and that the supplied power which is proportional to the value of dispersion s 2 under the PSD curve could be a new criterion for the calculation of fatigue life under combined loading. The searching for links between the spectral properties of the loading process and the fatigue life of structure under load is dealt with by new Grant GA No. 101/09/0904 of the Czech Technical University in Prague and the Institute of Thermomechanics of the Academy of Sciences of the Cz
机译：该贡献包括旨在寻找一种新方法的实验工作结果，该方法可通过力和随机特征力矩的组合来计算承受工作载荷的结构的疲劳寿命。考虑到断裂力学理论，那么材料的破坏既发生在微观塑性区，也发生在宏观塑性区，与塑性变形的上升有关，因此与塑性转化率有关，后者取决于所提供的能量。指示监视的频带中各个频率上的功率的功率谱密度（PSD）产生有关所提供能量数量的信息。因此，可以认为PSD形状和损伤大小之间存在相关性，并且与PSD曲线下的弥散度s ^ 2成正比的供电功率可以作为计算疲劳的新标准。组合载荷下的寿命。寻找载荷过程的光谱特性与结构在载荷作用下的疲劳寿命之间的联系的方法是由捷克布拉格技术大学的新Grant GA第101/09/0904号和美国科学院热力学研究所解决的。捷克共和国科学，VVI该贡献包括旨在寻找一种新方法的实验工作结果，该方法可通过力和随机特征力矩的组合来计算承受操作载荷的结构的寿命。考虑到断裂力学理论，那么材料的破坏既发生在微观塑性区，也发生在宏观塑性区，与塑性变形的上升有关，因此与塑性转化率有关，后者取决于所提供的能量。指示监视的频带中各个频率上的功率的功率谱密度（PSD）产生有关所提供能量数量的信息。因此，可以假设PSD形状与损伤大小之间存在相关性，并且与PSD曲线下的弥散度s 2成正比的供电功率可以作为计算寿命下的新标准。组合加载。布拉格捷克技术大学和科学院热力学研究所的新的Grant GA No 101/09/0904解决了在加载过程的光谱特性与受载荷结构寿命之间寻找联系的问题。捷克共和国该贡献包括旨在寻找一种新方法的实验工作结果，该方法可通过力和随机特征力矩的组合来计算承受工作载荷的结构的疲劳寿命。考虑到断裂力学理论，那么材料的破坏既发生在微观塑性区，也发生在宏观塑性区，与塑性变形的上升有关，因此与塑性转化率有关，后者取决于所提供的能量。指示监视的频带中各个频率上的功率的功率谱密度（PSD）产生有关所提供能量数量的信息。因此，可以认为PSD形状与损伤大小之间存在相关性，并且与PSD曲线下的弥散度s 2成正比的供电功率可以作为计算疲劳寿命的新标准。在联合加载下。寻找载荷过程的光谱特性与结构在载荷作用下的疲劳寿命之间的联系的方法是由捷克布拉格技术大学的新Grant GA第101/09/0904号和美国科学院热力学研究所解决的。捷克共和国科学，VVI该贡献包括旨在寻找一种新方法的实验工作结果，该方法可通过力和随机特征力矩的组合来计算承受操作载荷的结构的疲劳寿命。考虑到断裂力学理论，那么材料的破坏既发生在微观塑性区，也发生在宏观塑性区，与塑性变形的上升有关，因此与塑性转化率有关，后者取决于所提供的能量。指示监视的频带中各个频率上的功率的功率谱密度（PSD）产生有关所提供能量数量的信息。因此，可以认为PSD形状与损伤大小之间存在相关性，并且与PSD曲线下的弥散度s 2成正比的供电功率可以作为计算疲劳寿命的新标准。在联合加载下。寻找载荷过程的光谱特性与结构在载荷作用下的疲劳寿命之间的联系的方法是由捷克布拉格技术大学的新Grant GA第101/09/0904号和美国科学院热力学研究所解决的。捷克科学

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