According to the stress-strain curves of single-phase martensite and single-phase ferrite steels,whose compositions are similar to those of martensite and ferrite in low Si-Mn-Nb dual-phase steel,the stress-strain cur...According to the stress-strain curves of single-phase martensite and single-phase ferrite steels,whose compositions are similar to those of martensite and ferrite in low Si-Mn-Nb dual-phase steel,the stress-strain curve of the low Si-Mn-Nb dual-phase steel was simulated using the finite element method（FEM）.The simulated result was compared with the measured one and they fit closely with each other, which proves that the FE model is correct.Based on the FE model,the microstress and microstrain of the dual-phase steel were analyzed. Meanwhile,the effective factors such as the volume fraction of martensite and the yield stress ratio between martensite and ferrite phases on the stress-strain curves of the dual-phase steel were simulated,too.The simulated results indicate that for the low Si-Mn-Nb dual-phase steel, the maximum stress occurs in the martensite region,while the maximum strain occurs in the ferrite one.The effect of the volume fraction of martensite（fm） and the yield stress ratio on the stress-strain curve of the dual-phase steel is small in the elastic part,while it is obvious in the plastic part.In the plastic part of this curve,the strain decreases with the increase of f_M,while it decreases with the decrease of the yield stress ratio.展开更多
A fibre-optic interface stress sensor was used to characterize the mechanical property of UP resin/glass fibre adhersive interface. During the adhersion agent curing, the contract stress accompanies with dimension con...A fibre-optic interface stress sensor was used to characterize the mechanical property of UP resin/glass fibre adhersive interface. During the adhersion agent curing, the contract stress accompanies with dimension contracting, the thermal stress which is Produced by the changes of environment temperature caused by curing heat and the procedure of interface stress transmitting were all traced and determined, the micro mechanical properties of UP resin/glass fibre adhersive interface are determined. Also, the longchain softness couple agent has effcet on decreasing the stress concentration of UP resin/glass fibre adhersive interface interface and enhance the interface adhersive strength is verified.展开更多
基金supported by the Natural Science Foundation of Hebei Province(No.E2008000822) the Program for One Hundred Excellent Talents of Hebei Province,China.
文摘According to the stress-strain curves of single-phase martensite and single-phase ferrite steels,whose compositions are similar to those of martensite and ferrite in low Si-Mn-Nb dual-phase steel,the stress-strain curve of the low Si-Mn-Nb dual-phase steel was simulated using the finite element method（FEM）.The simulated result was compared with the measured one and they fit closely with each other, which proves that the FE model is correct.Based on the FE model,the microstress and microstrain of the dual-phase steel were analyzed. Meanwhile,the effective factors such as the volume fraction of martensite and the yield stress ratio between martensite and ferrite phases on the stress-strain curves of the dual-phase steel were simulated,too.The simulated results indicate that for the low Si-Mn-Nb dual-phase steel, the maximum stress occurs in the martensite region,while the maximum strain occurs in the ferrite one.The effect of the volume fraction of martensite（fm） and the yield stress ratio on the stress-strain curve of the dual-phase steel is small in the elastic part,while it is obvious in the plastic part.In the plastic part of this curve,the strain decreases with the increase of f_M,while it decreases with the decrease of the yield stress ratio.
文摘A fibre-optic interface stress sensor was used to characterize the mechanical property of UP resin/glass fibre adhersive interface. During the adhersion agent curing, the contract stress accompanies with dimension contracting, the thermal stress which is Produced by the changes of environment temperature caused by curing heat and the procedure of interface stress transmitting were all traced and determined, the micro mechanical properties of UP resin/glass fibre adhersive interface are determined. Also, the longchain softness couple agent has effcet on decreasing the stress concentration of UP resin/glass fibre adhersive interface interface and enhance the interface adhersive strength is verified.
