Numerical modelling of the laser surface processing of magnesia partially stabilized zirconia by the means of three-dimensional transient finite element analysis

2005 ◽  
Vol 462 (2065) ◽  
pp. 43-57 ◽  
Author(s):  
L Hao ◽  
J Lawrence
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Laser Processing ◽  
Laser Surface ◽  
Heat Radiation ◽  
Laser Source ◽  
Stabilized Zirconia ◽  
Surface Processing ◽  
Element Analysis ◽  
Partially Stabilized Zirconia

A numerical technique has been employed to use the ABAQUS finite element analysis (FEA) package in order to simulate the CO 2 laser surface processing of a magnesia partially stabilized zirconia (MgO-PSZ) bioinert ceramic. The transient FEA takes into account the heat radiation, heat convection and phase change during the laser processing. The heat source has been modelled as a stepwise moving laser source with small steps in the scanning direction to approximate continuous movement. It further extends and validates numerical methods by comparing experimental data of surface temperature for laser surface processing of the MgO-PSZ to the solution from the FEA model. Experiments involving CO 2 laser surface melting of the MgO-PSZ were also carried out using various laser process parameters, and the measured melt width and depth of laser-treated tracks were used to evaluate the validity of the models. In order to prevent the crack formation in the laser processing, pre- and post-heating were proposed by using the scanning of laser beam with the lower power before and after laser processing with high power to lower the thermal gradient.

Designing and Simulation of a Multi-Direction Tiny Force Switch

2012 ◽  
Vol 468-471 ◽  
pp. 895-898
Author(s):  
Tao Huang ◽  
Zhuo Qing Yang ◽  
Gui Fu Ding ◽  
Xiao Lin Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Vertical Direction ◽  
Horizontal Direction ◽  
Surface Processing ◽  
Element Analysis ◽  
Movable Electrode ◽  
Fixed Electrode ◽  
Test Result

This paper describes the designing and producing of a multi-direction tiny force switch, which is based on the technology of micro-surface processing on privative silicon. The switch is mainly formed by shore, overhanging spring, movable electrode and fixed electrode. Its’ structure material is Ni. The parameters of switch are confirmed by doing finite-element analysis with ANSYS. And rigidities of structure both on horizontal direction and vertical direction are analyzed by using ANSYS to ensure that the uniformity of switch rigidity is qualified. After producing the switch, the rigidity of switch is tested by using bonding tester. The test result shows that the rigidity is almost qualified with requirements.

scholarly journals 3D Finite Element analysis of Laser Surface Glazing to Investigate Temperature Effects on Surface of Ti64 Alloy

2018 ◽  
Author(s):  
Israt Rumana Kabir ◽  
Danqing Yin ◽  
Nusrat Tamanna ◽  
Sumsun Naher
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Significant Role ◽  
Surface Hardness ◽  
Laser Surface ◽  
Element Analysis ◽  
3D Finite Element ◽  
3D Finite Element Analysis ◽  
Heating And Cooling ◽  
Ti64 Alloy

Ti64 alloy plays a significant role in the biomedical applications such as bioimplants for its excellent biocompatibility. Its usage can be further extended by improving the surface hardness and wear resistance. In this respect, laser surface glazing (LSG), an advanced surface modification technique, is very useful which can produce thin hardened surface layer and strong metallurgical bonding. Investigation of temporal and spatial temperature distributions of laser glazed surface of materials are essential because temperature plays significant role in achieving required surface properties. Therefore, in this study, a 3D Finite element analysis has been developed to perform transient thermal analysis of LSG for Ti64 alloy. The model investigated temperature distribution, depth of modified zone and heating and cooling. The results show that the peak temperature is attained 2095 K for 300 W laser power, 0.2 mm beam width and 0.15 ms residence time. Since this temperature is above the melting point (1933 K) of Ti64 alloy, the melt depth is calculated 22.5 μm. Furthermore, from the simulation results, the average heating and cooling rates are estimated 1.19×107 Ks-1 and 2.71×106 Ks-1 respectively which indicate the presence of hard phases in the modified zone.

Assessment of a Damaged Piping System Utilizing Laser Surface Scanning and Finite Element Analysis

2004 ◽  
Author(s):  
Hilliard L. Livingston ◽  
Richard P. Brodzinski
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Laser Scanning ◽  
Laser Surface ◽  
Oil Refinery ◽  
Piping System ◽  
Analysis Model ◽  
Surface Geometry ◽  
Surface Scanning ◽  
Element Analysis

The application of laser surface scanning technology in conjunction with finite element analysis to evaluate the fitness for service of a damaged section of piping is presented in this paper. The difference between the results obtained using a simplified dimensional model produced using hand measurements and the laser scan is also discussed. A section of NPS 18 (DN 450) diameter piping that carries vapors generated by a coke drum in an oil refinery delayed coking unit had been damaged in service from contact with a nearby structural steel member. The damaged area was deformed nearly 1.2 in. (30 mm) deep over an area measuring approximately 10 in. × 12 in. (250 mm × 300 mm) and included a pronounced crease along the line of contact with the steel. The piping was also slightly out of round outside of the area of gross distortion. Laser scanning was employed to obtain an accurate dimensional representation of the surface geometry and to develop a finite element analysis model. The decision to allow the piping system to continue to operate until the next scheduled outage was then based upon the operating stresses, maximum strain in the deformed area and fatigue life determined for the damaged section.

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