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Machining Error Inspection of T-Spline Surface by On- Machine Measurement
Jintao Lai,Jianzhong Fu,Hongyao Shen,Wenfeng Gan,Zichen Chen 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
A new method for machining error inspection of T-spline surface by on-machine measurement (OMM) is investigated in this study. With the presented method, a relatively small number of sampling points are needed to evaluate the machining error of the surface. The sampling strategy based on the dominant of the control vertex is proposed. Based on the inspection data, the machined surfacecan be obtained through a T-spline surface reconstruction algorithm. Verification experiments showed that the inspection errorbetween the OMM method and the coordinate measuring machine (CMM) method is within 13.3%. Simulation results shows that thefitting error in critical area can be improved with less additional sampling points while the surface is presented in T-spline surface.
Experiments and simulations of the ballistic response of ceramic composite armors
Jinfeng Cao,Jianzhong Lai,Jiehang Zhou,Ningyu Kang,Longyu Du,Yiqiu Miao 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7
A lightweight multilayer ceramic composite armor with a sandwich structure back plate was proposed by studying the penetration process, damage mechanism, and the function of each layer of the composite armor against the 12.7 mm armor-piercing projectile. The effectiveness of the simulation was verified by comparing the experimental and simulation data. The effects of crack initiation in the ceramics, abrasion of ceramics, and size of ceramic cones on the penetration resistance of targets were discussed. The structural configuration of backplate sequence and thickness ratio was optimized through finite element simulation on ANSYS/LS-DYNA. Results indicate that boundary constraints have a significant effect on the antipenetration performance of ceramics. The antipenetration performance is the best when the structure of restrained composite armor is Al6061/Al 2 O 3 /TC4/ Kevlar ® /TC4 and the thickness ratio of the TC4 transition and back plates is 4:3.