Influence of process parameters and bump geometry on the residual stress distribution in a chip-on-foil bonding process

2005 ◽  
Author(s):  
P. Suter ◽  
R. Bauknecht ◽  
T. Graf ◽  
H. Duran ◽  
I. Venter
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Process Parameters ◽  
Residual Stress Distribution ◽  
Bonding Process ◽  
Influence Of Process Parameters

The effect of process parameters on the residual stress of selective laser melted Inconel 718 thin-walled part

2019 ◽  
Vol 25 (8) ◽  
pp. 1359-1369 ◽  
Author(s):  
Changpeng Chen ◽  
Jie Yin ◽  
Haihong Zhu ◽  
Xiaoyan Zeng ◽  
Guoqing Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Process Parameters ◽  
Inconel 718 ◽  
Equivalent Stress ◽  
Residual Stress Distribution ◽  
Content Type ◽  
Maximum Equivalent Stress ◽  
Scan Speed ◽  
Thin Walled

Purpose High residual stress caused by the high temperature gradient brings undesired effects such as shrinkage and cracking in selective laser melting (SLM). The purpose of this study is to predict the residual stress distribution and the effect of process parameters on the residual stress of selective laser melted (SLMed) Inconel 718 thin-walled part. Design/methodology/approach A three-dimensional (3D) indirect sequentially coupled thermal–mechanical finite element model was developed to predict the residual stress distribution of SLMed Inconel 718 thin-walled part. The material properties dependent on temperature were taken into account in both thermal and mechanical analyses, and the thermal elastic–plastic behavior of the material was also considered. Findings The residual stress changes from compressive stress to tensile stress along the deposition direction, and the residual stress increases with the deposition height. The maximum stress occurs at both ends of the interface between the part and substrate, while the second largest stress occurs near the top center of the part. The residual stress increases with the laser power, with the maximum equivalent stress increasing by 21.79 per cent as the laser power increases from 250 to 450 W. The residual stress decreases with an increase in scan speed with a reduction in the maximum equivalent stress of 13.67 per cent, as the scan speed increases from 500 to 1,000 mm/s. The residual stress decreases with an increase in layer thickness, and the maximum equivalent stress reduces by 33.12 per cent as the layer thickness increases from 20 to 60µm. Originality/value The residual stress distribution and effect of process parameters on the residual stress of SLMed Inconel 718 thin-walled part are investigated in detail. This study provides a better understanding of the residual stress in SLM and constructive guidance for process parameters optimization.

scholarly journals Investigation on micro-residual stress distribution near hole using nanoindentation: Effect of drilling speed

2019 ◽  
Vol 52 (9-10) ◽  
pp. 1252-1263 ◽  
Author(s):  
Abhishek Kumar Tiwari ◽  
Amit Kumar ◽  
Navin Kumar ◽  
Chander Prakash
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Process Parameters ◽  
Residual Stress Distribution ◽  
Stress Generation ◽  
Work Piece ◽  
Drilling Speed ◽  
Drilling Operation

Residual stresses are induced in the material during manufacturing operations, which considerably affect the fatigue performance and the lifespan of a mechanical work piece. The nature, magnitude, and distribution of residual stresses decide their beneficial or detrimental effects. Past research efforts concluded that mechanical process parameters influence residual stress nature, distribution, and the magnitude. Nevertheless, how residual stress generation depends on the process parameters, is not well investigated especially in the case of a drilling operation. In fact, the residual stress field is required to be regulated near drilled holes to improve the fatigue strength of structural joints, especially in the aircraft industry. Accordingly, this work attempts to estimate the drilling-induced micro-residual stress distribution near the drilled hole. In addition, the effect of drilling speed on residual stress distribution has also been studied. A nanoindentation technique is used to follow-up precise distribution of micro-residual stresses near the holes drilled at three different drilling speeds of 700, 900, and 1100 r/min. The outcomes indicate the presence of compressive residual stresses near the hole. In addition, an increase in residual stress level is noticed with an increase in the drilling speed up to 900 r/min. A uniform distribution of residual stresses is observed near the hole when drilled at a higher drilling speed of 1100 r/min. These findings may be useful in planning an improved drilling operation to produce beneficial residual stress distribution. This may ultimately improve the fatigue strength and the service life of mechanical components or structures with drilled holes.

Effect of Process Parameters on Residual Stress Distribution during Direct Laser Metal Deposition Shaping

2014 ◽  
Vol 989-994 ◽  
pp. 49-54
Author(s):  
Hao Wang
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Process Parameters ◽  
Residual Stress Distribution ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Scanning Velocity ◽  
Life And Death ◽  
Direct Laser ◽  
Direct Laser Metal Deposition

In order to improve the quality of sample and decrease the stress during process, it is important to study the residual stress distribution during direct laser metal deposition (LMDS) process. In this paper, according to the “element life and death” technique of finite element method ,with APDL, we simulated the effects of Laser power, scanning velocity, substrate preheat temperature and powder addition speed in top layer of samples residual stress distribution during whole LMDS process are studied. The residual stress distribution under different process parameters is researched in detail. Using the same process parameters, the simulation results show good agreement with the features of sample which fabricated by LMDS.

Study of Impact Velocity on Residual Stress and Surface Hardness of SKD11 in Shot Peening Process

2020 ◽  
Vol 304 ◽  
pp. 127-134
Author(s):  
Pudsadee Chupong ◽  
Karuna Tuchinda
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Impact Velocity ◽  
Process Parameters ◽  
Material Properties ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Surface Hardness ◽  
Impact Angle ◽  
Residual Stress Distribution

Shot peening process could create compressive residual stress and increase surface hardness and hence also used to improve material surface properties in case thermal effect is to be avoided. The shot peening process parameters such as pressure which result in different shot impact velocity could affect the compressive residual stress distribution which results in different post-process material properties. The ability to understand and predict the effect of process parameters on stress distribution could be very useful to control and obtain material properties as required. In this work, a shot peening process commercially available locally was investigated. The residual stress distribution after shot peening of SKD11 was studied using the finite element (FE) technique. A single shot impact was simulated. A maximum velocity with a miximum impact angle was assumed. The computational predictions showed higher compressive residual stress developed with increasing shot velocity as expected due to higher impact energy. However, experimental results suggested that the process arrangement and machine control highly affect the properties of the material after process. The compressive residual stress and surface hardness obtained experimentally was almost unchanged with an increase in pressure from 0.35MPa to 0.6MPa. It was found that, due to machine arrangement, an increase in impact velocity at higher pressure was relatively small and did not observed in all effected area due to fixed arrangement of nozzle and samples. Hence, research results suggested that a detail computational methodology including the effect of unevent impact velocity and impact angle should be employed to increase the predictive ability of the FE model. The current work could be extended to include such effects with no major difficulty to develop useful information for the design of shot peening process for any specific machine and arrangement.

Influence of the Welded Joint on the Mechanical Behavior of Steel Piles during Static and Dynamic Deformation

2007 ◽  
Vol 345-346 ◽  
pp. 1469-1472
Author(s):  
Gab Chul Jang ◽  
Kyong Ho Chang ◽  
Chin Hyung Lee
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Mechanical Behavior ◽  
Welded Joint ◽  
Dynamic Deformation ◽  
Three Dimensional ◽  
Steel Structures ◽  
Residual Stress Distribution ◽  
Dynamic Mechanical Behavior ◽  
Steel Piles

During manufacturing the welded joint of steel structures, residual stress is produced and weld metal is used inevitably. And residual stress and weld metal influence on the static and dynamic mechanical behavior of steel structures. Therefore, to predict the mechanical behavior of steel pile with a welded joint during static and dynamic deformation, the research on the influence of the welded joints on the static and dynamic behavior of steel pile is clarified. In this paper, the residual stress distribution in a welded joint of steel piles was investigated by using three-dimensional welding analysis. The static and dynamic mechanical behavior of steel piles with a welded joint is investigated by three-dimensional elastic-plastic finite element analysis using a proposed dynamic hysteresis model. Numerical analyses of the steel pile with a welded joint were compared to that without a welded joint with respect to load carrying capacity and residual stress distribution. The influence of the welded joint on the mechanical behavior of steel piles during static and dynamic deformation was clarified by comparing analytical results

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