The small punch test technique （SPT） was used to evaluate the mechanical properties of various materials and the basic method to test material tensile mechanics peqeormance from an inverse finite element （ FE） ari...The small punch test technique （SPT） was used to evaluate the mechanical properties of various materials and the basic method to test material tensile mechanics peqeormance from an inverse finite element （ FE） arithmetic with SPT was put forward. The research shows that specific tensile mechanical behavior and strain-stress distribution of each district of weld seam can be accurately determined by small punch test. Therefore, mechanical behavior of the inhomogeneous joint can be predicted by a numerical model. The simulation comes to good agreement with experimental data.展开更多
In order to evaluate the tendency of mechanical properties degrudation due to weld-ing and other processing in materials used for supporting coils in super conducting rnaguets utilized in thermonuclear jusion reactore...In order to evaluate the tendency of mechanical properties degrudation due to weld-ing and other processing in materials used for supporting coils in super conducting rnaguets utilized in thermonuclear jusion reactore, a small punch (SP) test was used.This test, which was originally developed to study irradiation damage using miniatursized specimens was performed at 77 and 4 K for solution treated and sensitized JN1 austenitic stainless steel, a candidate cryogenic structural material. The area under the load-deflection curve up to the maximum applied load in SP test was defined as the SP enerpy, to characterize the resistance to fracture. Although solution treated material exhibited ductile fracture mode with high SP enerpy, embrittlement behavior due to sensitization at 650-800°for 1-5 h was shown clearlg by SP test with brittle intergranular fracture and decreased SP enerpy. Comparison of the results obtained by SP test with those by fracture toughness test showed the usefulness of SP test for evaluation of sensitization induced embrittlement at cryogenic temperature. The re-sults obtained in this study can be very usefol in predicting the degradation due to welding and other processing in cryogenic materials.展开更多
小样品力学性能试验方法(Modified Small Punch Tests,简称MSP)是评价陶瓷材料力学性能的一种有效方法.采用改进型多场耦合小冲压(MSP)试验法评价了Pb(Zr,Ti)O3陶瓷(PZT)在力电耦合和纯力场下的疲劳性能.通过对比在纯力场和力电耦合下...小样品力学性能试验方法(Modified Small Punch Tests,简称MSP)是评价陶瓷材料力学性能的一种有效方法.采用改进型多场耦合小冲压(MSP)试验法评价了Pb(Zr,Ti)O3陶瓷(PZT)在力电耦合和纯力场下的疲劳性能.通过对比在纯力场和力电耦合下的力学性能可以看出:与纯力场下相比,PZT陶瓷在力电耦合下的断裂强度会降低.在力场和电场的同时作用下,疲劳寿命显著缩短,压电陶瓷材料内部易出现沿晶断裂.展开更多
文摘The small punch test technique （SPT） was used to evaluate the mechanical properties of various materials and the basic method to test material tensile mechanics peqeormance from an inverse finite element （ FE） arithmetic with SPT was put forward. The research shows that specific tensile mechanical behavior and strain-stress distribution of each district of weld seam can be accurately determined by small punch test. Therefore, mechanical behavior of the inhomogeneous joint can be predicted by a numerical model. The simulation comes to good agreement with experimental data.
文摘In order to evaluate the tendency of mechanical properties degrudation due to weld-ing and other processing in materials used for supporting coils in super conducting rnaguets utilized in thermonuclear jusion reactore, a small punch (SP) test was used.This test, which was originally developed to study irradiation damage using miniatursized specimens was performed at 77 and 4 K for solution treated and sensitized JN1 austenitic stainless steel, a candidate cryogenic structural material. The area under the load-deflection curve up to the maximum applied load in SP test was defined as the SP enerpy, to characterize the resistance to fracture. Although solution treated material exhibited ductile fracture mode with high SP enerpy, embrittlement behavior due to sensitization at 650-800°for 1-5 h was shown clearlg by SP test with brittle intergranular fracture and decreased SP enerpy. Comparison of the results obtained by SP test with those by fracture toughness test showed the usefulness of SP test for evaluation of sensitization induced embrittlement at cryogenic temperature. The re-sults obtained in this study can be very usefol in predicting the degradation due to welding and other processing in cryogenic materials.
文摘小样品力学性能试验方法(Modified Small Punch Tests,简称MSP)是评价陶瓷材料力学性能的一种有效方法.采用改进型多场耦合小冲压(MSP)试验法评价了Pb(Zr,Ti)O3陶瓷(PZT)在力电耦合和纯力场下的疲劳性能.通过对比在纯力场和力电耦合下的力学性能可以看出:与纯力场下相比,PZT陶瓷在力电耦合下的断裂强度会降低.在力场和电场的同时作用下,疲劳寿命显著缩短,压电陶瓷材料内部易出现沿晶断裂.
