...Aamer A. Kazi; Mirza Akhter; Dion Antao; David Staack; Bruce L. Tai This paper studies the effects of plasma-induced cracks on rock cutting to support the concept of a plasma-integrated drag bit for accelerated geothermal drilling through hard rocks. For this, a single polycrystalline diamond...

... strength, low relative density, and excellent osteoconductive properties. Forming of the foam improves nestability during manufacture and is essential to have the material achieve the desired shape. Experimentally, bending about a single axis using a wiping die is studied by observing cracking...

... adjustment reduces weld flash and improves the appearance of the weld. 10 06 2009 03 04 2011 09 06 2011 09 06 2011 adhesion aluminium alloys butt welding closed loop systems cracks force control forge welding heat treatment maintenance engineering milling machines...

.... The change in the normal cutting force as a function of grain penetration speed and depth was experimentally established in microcutting of two types of granite originating from Serbia. Based on the grain traces on granite and the generated cracks, the critical grain penetration depth for the formation...

...P. C. Tan; S. H. Yeo The thickness of recast layers produced during electrical discharge machining (EDM) is an important process performance measure as it may indicate an extent of crack propagation in a machined surface or thickness of a functional layer alloyed onto a machined surface. Thus...

... to the experimental results, a thermomechanical finite element (FE)-simulation was applied for investigating the temperature distribution and thermal stress in the thickness direction of the specimen. Cracks, as the primary defect, were summarized to three kinds: “Y” cracks, straight cracks, and arc cracks, while...

... from reaching excessive temperatures in hot engine environments. Delamination of the TBC is the main problem of laser drilling acute angled holes in the coated components. The present study investigates the mechanisms involved in the development of the delamination cracks. A significant role of melt...

...R. Akarapu; A. E. Segall During a variety of high-speed cutting operations that can include both laser and traditional saw methods, full workpiece support is not always practical or even possible. As a result, costly premature fractures and associated damage such as chips, burrs, and cracks (micro...

... of application, stretch flange forming of these aluminum alloy sheets is considered. The AA5754 stretch flange displays a circumferential crack during failure, whereas the AA5182 stretch flange fails through a radial crack at the edge of the cutout. It is shown that the necking predictions obtained using...

... examines the feasibility of depositing CoCrMo coatings on Ti substrates using Laser Engineered Net Shaping ® . Studies show that deposition of CoCrMo coating on a Ti substrate is very challenging, cracking and delamination being the major observations. Several alternative strategies, which may lead...

... of the allograft interference fits using dimensional measurements of manufactured components at all stages of the manufacturing process, followed by examination for cracking and measurement of the pull-apart forces for assemblies. The experimental results are compared to finite element models of the interference...

... until the sample fractured. Plastic deformation of the samples was examined: the out-of-plane plastic volume was shown to equal the volume displaced by the wedge. Cracks that developed from the side of the wedge tip during indention propagated with near steady-state loads under edge surface indention...

...Yinggang Tian; Yung C. Shin A multiscale finite element model is developed to simulate the chip formation in laser-assisted machining of silicon nitride ceramics. To consider the workpiece heterogeneous microstructure and crack evolution in silicon nitride machining, the workpiece material...

... ahead of the tool associated with material separation leading to chip formation is shown. The measured constant force and the force needed for ductile crack extension are then compared. Lucca , D. A. , Rhorer , R. L. , and Komanduri , R. , 1993 , “ Effect of Tool Edge Geometry...

... residual stresses attract significant attention because they may initiate cracks on the surface, either immediately after grinding or under in-service loading. Cracking will significantly reduce component life. Thus, avoidance of surface damage in general, and residual stresses in particular, dominates any...

... to eliminate cracking and fracture of the workpiece during laser heating. The LAM process is characterized in terms of cutting force, surface temperature, chip morphology, tool wear, surface roughness and subsurface damage for a variety of operating conditions. Estimated material removal temperatures...

...Martin Ba¨ker; Joachim Ro¨sler; Carsten Siemers The mechanism behind chip segmentation of titanium alloys is still unclear. Experimentally, different kinds of deformation patterns are observed. In this paper we perform a finite element analysis where chip segmentation is done by introducing cracks...

...Hongyan Zhang; Jacek Senkara; Xin Wu In this paper mechanical aspects of cracking during single- and multi-spot welding of AA5754 was investigated by both experimental and analytical approaches. The impact of mechanical loading on crack initiation and propagation was studied with the consideration...

... on machining defects. The results of the experiments show that hydrostatic pressure is efficient in minimizing machining defects and optimizing the productivity of the hard-brittle materials used in these experiments. Based on these findings, the paper concludes that the origin of a machining crack must exist...

...Ge´rard Poulachon; Alphonse L. Moisan A 100Cr6 (AISI E52100) steel in the hardness range of 180 to 750 HV 10 was machined. Quick stop tests were carried out at various hardness values to observe the different chip formation mechanisms. A limit was found between the shearing and cracking chip...