Experimental study on crack propagation of stainless steel 304 material under amplitude overloads

International Seminar on Metallurgy and Materials

Hartanto, Andreas^1 ; Himawan, Roziq^2 ; Sutanto, Hadi^1

Department of Mechanical Engineering, Atma Jaya Catholic University, Indonesia^1

Center for Nuclear Reactor Technology and Safety, National Nuclear Energy Agency, Indonesia^2

关键词: Crack propagation tests;    Dynamic loadings;    Dynamic testing;    External loads;    Fatigue mechanism;    Operating loads;    Stainless steel-304;    Transient conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/541/1/012021/pdf
DOI  :  10.1088/1757-899X/541/1/012021

来源: IOP

【 摘 要 】

Fatigue mechanisms caused by dynamic loadings starts with cracks that occurred in a material. Under conditions such as transient conditions, an earthquake or instantaneous external loads, some parts of nuclear reactor that initially receive operating loads can be overloaded. The purpose of this research is to investigate the change of crack propagation in stainless steel 304 material related with amplitude overloads. The crack propagation test used the axial dynamic testing with the maximum stress (σ max) of 145 MPa, stress ratio R = 0.1 and over loading ratio (OVR) of 1.5, 1.75, 2. The results showed that the amplitude overloads caused the crack to propagate slowly as the crack tip formed a branch. The higher crack growth rate also showed the higher stress intensity factors in the crack tip.