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2 Journal of Theoretical and Applied Mechanics

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Research on parameters of MMC fracture criterion for advanced high strength dual-phase steel sheets

Fu Qiutao, Li Di, Song Hui, Liu Xingfeng, Lu Zipeng, Cui Hongjian

Journal of Theoretical and Applied Mechanics

2022

Vol. 60 nr 2

253--265

To predict the shear fracture, tests of advanced high-strength DP steels have been carried out, and fracture models of DP steels have been established using the MMC fracture model. The MMC fracture parameters were obtained through multiple sets of experiments and stress triaxiality solved by simulation. The result was verified by stretch-bending, Nakazima tests and simulations. It shows that the MMC criterion is suitable for predicting ductile fracture of DP980, 1180. The correlation between the parameters of the MMC criterion and DP steel material properties can reduce the amount of tests data required.

The influence of tongue weight of a trailer-mounted recreational vehicle on steering stability

Li Mengdi, Li Di, Fu Qiutao, Yang Zhichen, Wang Weiyuan

Journal of Theoretical and Applied Mechanics

2021

Vol. 59 nr 2

203--213

The influence of tongue weight on a Trailer-Mounted Recreational Vehicle (TMRV) is studied. A multi-body dynamic model of the TMRV was established, three typical vehicle stability tests were carried out. Tongue weight had different effects on the tractor and Recreational Vehicle (RV). According to different loads, the critical tongue weight range was given. In addition, the tongue weight of the existing models was optimized and suggestions for improvement were put forward. The analysis results show that the tongue weight should be within a reasonable range which can ensure the tractor understeer and keep the lateral stability of the RV.