The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform

E. A. Badr - One of the best experts on this subject based on the ideXlab platform.

  • Stress Concentration FACTORS FOR PRESSURIZED ELLIPTIC CROSSBORES IN BLOCKS—PART II—EFFECT OF BLOCK GEOMETRY
    Experimental Techniques, 2009
    Co-Authors: E. A. Badr
    Abstract:

    The Stress Concentration Point at the intersection of elliptical crossbores in rectangular blocks has been investigated. Again, the results showed that elliptical crossbores intersection produce Stress Concentration factors lower than those found at circular crossbores intersections. These findings corroborate with Faupel’s3 results concerning Stress Concentration factors for elliptic side holes in cylinders and infinite plates. Furthermore, this study showed that Stress Concentration factors of elliptical crossbores in rectangular blocks are lower than those found in cubical blocks.1 Specifically, this reduction is pronounced for W/a ⩾ 2.5 over the whole range of a2/a1 and are compressive for θ = 60°.

  • Stress Concentration factors for pressurized elliptic crossbores in blocks
    International Journal of Pressure Vessels and Piping, 2006
    Co-Authors: E. A. Badr
    Abstract:

    Abstract Intersecting bore geometries are used in a number of industrial applications including heavy-walled pressure vessels containing oil holes for lubrication, ports for valves and fluid ends of reciprocating pumps. The bore intersection location is a Stress Concentration Point where the maximum hoop Stress can be many times the fluid pressure in the bores. Intersecting circular holes in heavy-walled cylinders and rectangular blocks have been extensively investigated. Specifically, Stress/pressure Concentration curves for intersecting circular bores in rectangular blocks were presented by Sorem et al. [Sorem JR, Shadley JR, Tipton SM. Design curves for maximum Stresses in blocks containing pressurized bore intersections. ASME J Mech Des 1990; 113: 427–31.]. However, Stress/pressure Concentrations due to intersecting elliptic bores have not been broadly investigated. With the availability of computer numerical control (CNC) machinery, bores with elliptic crosssection can be produced with relative ease. In this paper, hoop Stress Concentration ratios are developed for elliptic crossbores in rectangular blocks. Results indicate that introducing elliptic crossbores, rather than circular ones, significantly reduces the hoop Stress Concentration factor at the crossbore intersection. Also, the presence of intersecting crossbores has a major effect on the fatigue life of pressure vessels [Badr EA, Sorem JR, Jr Tipton SM. Evaluation of the autofrettage effect on fatigue lives of steel blocks with crossbores using a statistical and a strain-based method. ASTM J Test Eval 2000; 28: 181–8.] and the reduction of hoop Stress Concentration is expected to enhance the fatigue life of pressure vessels containing crossbores.

Sinopec Northwest - One of the best experts on this subject based on the ideXlab platform.

  • Eopaleozoic inversion structures in the Tazhong Uplift and their significance to petroleum geology
    Oil and Gas Geology, 2010
    Co-Authors: Sinopec Northwest
    Abstract:

    By using typical seismic interpretation results,this paper focuses on a discussion of the development characteristics of the Eopaleozoic inversion structures in the Tazhong uplift and an analysis of their petroleum geological significance.The basement normal faults that were developed during the Sinian to the Early-Middle Ordovician controlled the later structural deformation styles,resulting in two inversion structural styles in the Tazhong uplift.The azimuth of the pre-exiting fault with larger dip angle might not be favorable for its further inversion and forced the inversion to the adjacent faults.The early faults might then serve as Stress Concentration Point for later thrust faults,such as the Tazhong-Ⅱ fault belt and the Tazhong-10 fault belt.Or,they might be buckled by later compressional structures,such as the Tazhong-Ⅰfault belt.It is suggested that an inversion structure contributes in its early stage to hydrocarbon accumulation and forms in its later stage inverted anticlines with different amplitudes that are favorable traps for hydrocarbon accumulation.

Xin Tan - One of the best experts on this subject based on the ideXlab platform.

  • The Tooth Contact Analysis of a Heavy-load Planetary Gearing
    Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering, 2015
    Co-Authors: Xin Tan
    Abstract:

    Keywords: Planetary gearing; Tooth contact analysis; Modal analysis; ANSYS Abstract. This paper presents a method for analyzing the tooth contact situations of a heavy-load planetary gearing based on Ansys Workbench. Firstly, a 3D finite element model of the whole gearing is established with 10 node tetrahedron elements. Then forces and loads bearing by the gearing are applied on the model to test the static strength. Some key parts of the gearing, such as planetary carriers and the sun gears, are specially checked. Finally, the Stress Concentration Point of the engaging tooth of the second stage of the gearing is examined by the tooth contact analysis. The results show that the static strength is enough but the roots of the engaging tooth have higher Stress than other areas.

Tan Xin - One of the best experts on this subject based on the ideXlab platform.

  • The Tooth Contact Analysis of a Heavy-load Planetary Gearing
    2015
    Co-Authors: Tan Xin
    Abstract:

    This paper presents a method for analyzing the tooth contact situations of a heavy-load planetary gearing based on Ansys Workbench. Firstly, a 3D finite element model of the whole gearing is established with 10 node tetrahedron elements. Then forces and loads bearing by the gearing are applied on the model to test the static strength. Some key parts of the gearing, such as planetary carriers and the sun gears, are specially checked. Finally, the Stress Concentration Point of the engaging tooth of the second stage of the gearing is examined by the tooth contact analysis. The results show that the static strength is enough but the roots of the engaging tooth have higher Stress than other areas.

Erjia Liu - One of the best experts on this subject based on the ideXlab platform.

  • Effect of coating thickness on microstructure, mechanical properties and fracture behaviour of cold sprayed Ti6Al4V coatings on Ti6Al4V substrates
    Surface and Coatings Technology, 2018
    Co-Authors: Adrian Wei-yee Tan, Wen Sun, Ayan Bhowmik, Jun Yan Lek, Iulian Marinescu, Nay Win Khun, Zhili Dong, Erjia Liu
    Abstract:

    Abstract Cold spray is a relatively new coating technology by which coatings can be produced without significant heating of the sprayed powder. This has gained attention in the aerospace industry as cold spray has the potential to restore damaged parts made of light metal alloys, like Ti6Al4V (Ti64 in short) components. Such repair requires high quality Ti64 coatings of varying coating thicknesses to fill the damages incurred in worn or corroded parts. However, the study of the effect of coating thickness for Ti64 coatings deposited on Ti64 substrates on their microstructure and mechanical properties has not been reported. In this work, high quality Ti64 coatings with different thicknesses were successfully deposited on Ti64 substrates. It was observed that the microstructure and mechanical properties such as low porosity levels, high hardnesses and strong adhesion strengths of the Ti64 coatings were maintained with increasing coating thickness, and thereby the process holds a great potential in the repair industries. The interface bond strength was also successfully measured with a glueless tensile test. As for the flexural strength, the thinner Ti64 coatings could conform to higher Stress Concentration Point, better than the thicker coatings. The fracture characteristics of the coatings were also investigated.