Deformation control in micro-milling of thin-walled structures

2015 ◽  
Vol 81 (5-8) ◽  
pp. 967-974 ◽  
Author(s):  
Zhaojun Kou ◽  
Yi Wan ◽  
Zhanqiang Liu ◽  
Yukui Cai ◽  
Xichang Liang
Keyword(s):  
Micro Milling ◽  
Deformation Control ◽  
Thin Walled Structures ◽  
Thin Walled

Study on the Micro Milling Process of the Inertial MEMS Components

2007 ◽  
Author(s):  
Bo Wang ◽  
Yan Zhao ◽  
Ying Chun Liang
Keyword(s):  
Cutting Parameters ◽  
Milling Process ◽  
Micro Milling ◽  
Milling Machine ◽  
Thin Walled Structures ◽  
Stable Performance ◽  
Thin Walled ◽  
Micro Structures ◽  
Optimal Cutting Parameters ◽  
Better Than

Micro milling technology is used in the manufacturing of the inertial MEMS components with 3D micro structures. Firstly, a 3-axis micro milling machine was developed. The positioning accuracy of all the 3 axis is better than 0.25 μm and the highest spindle speed is 160,000RPM. Then, using this machine, the optimal cutting parameters are studied and the components are successfully manufactured. Finally, to ensure the stable performance of the components, laser cofocus microscope and a new method called micro-bridge method is introduced to estimate the roughness, elastic modulus and residual stress of the micro milled thin-walled structures in the inertial MEMS components and this is a good try to evaluate the surface quality produced by micro milled method.

Frame-Monolithic Technology of Construction of Low-Rise Buildings Made of Foam Gypsum and Steel Thin-Walled Structures

2018 ◽  
Vol 762 (8) ◽  
pp. 36-39 ◽  
Author(s):  
B.G. BULATOV ◽  
◽  
R.I. SHIGAPOV ◽  
M.A. IVLEV ◽  
I.V. NEDOSEKO ◽  
...  
Keyword(s):  
Thin Walled Structures ◽  
Thin Walled

scholarly journals Fracture Mechanical Analysis of Thin-Walled Cylindrical Shells with Cracks

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 592
Author(s):  
Feng Yue ◽  
Ziyan Wu
Keyword(s):  
Fracture Mechanics ◽  
Tensile Stress ◽  
Failure Modes ◽  
Cylindrical Shells ◽  
Crack Tip ◽  
Mechanical Analysis ◽  
J Integral ◽  
Thin Walled Structures ◽  
Circumferential Tensile Stress ◽  
Thin Walled

The fracture mechanical behaviour of thin-walled structures with cracks is highly significant for structural strength design, safety and reliability analysis, and defect evaluation. In this study, the effects of various factors on the fracture parameters, crack initiation angles and plastic zones of thin-walled cylindrical shells with cracks are investigated. First, based on the J-integral and displacement extrapolation methods, the stress intensity factors of thin-walled cylindrical shells with circumferential cracks and compound cracks are studied using linear elastic fracture mechanics, respectively. Second, based on the theory of maximum circumferential tensile stress of compound cracks, the number of singular elements at a crack tip is varied to determine the node of the element corresponding to the maximum circumferential tensile stress, and the initiation angle for a compound crack is predicted. Third, based on the J-integral theory, the size of the plastic zone and J-integral of a thin-walled cylindrical shell with a circumferential crack are analysed, using elastic-plastic fracture mechanics. The results show that the stress in front of a crack tip does not increase after reaching the yield strength and enters the stage of plastic development, and the predicted initiation angle of an oblique crack mainly depends on its original inclination angle. The conclusions have theoretical and engineering significance for the selection of the fracture criteria and determination of the failure modes of thin-walled structures with cracks.

Multi-physics modeling of direct energy deposition process of thin-walled structures: defect analysis

2021 ◽  
Vol 67 (4) ◽  
pp. 1229-1242
Author(s):  
Shuhao Wang ◽  
Lida Zhu ◽  
Yichao Dun ◽  
Zhichao Yang ◽  
Jerry Ying Hsi Fuh ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Deposition Process ◽  
Defect Analysis ◽  
Direct Energy Deposition ◽  
Thin Walled Structures ◽  
Direct Energy ◽  
Thin Walled ◽  
Physics Modeling
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