compressive residual stresses effect on fatigue life

2019-4-12The presence of compressive residual stress and its combination with hoop stress also modifies the Hertz stress life relation This article analyzes the beneficial effect of residual stresses on rolling-element bearing fatigue life in the presence of high hoop stresses for three bearing steels 2016-6-29showed that fatigue life improvement resulting from shot peening can be attributed to the maximum residual stress and also to the depth of the plastically deformed layer A correlation was found between the fatigue life and the area under the residual stress curve In general fatigue crack initiation occurs on the speci-men surface

Compressive Residual Stress

Low-temperature grinding produces compressive residual stresses and improves fatigue life This beneficial result is due to the mechanical grinding force applied to the surface which has a similar effect to surface peening Conversely high-temperature grinding of hardened components produces tensile residual stresses that shorten fatigue life

2019-1-9austenite and compressive residual stresses on rolling contact fatigue through XFEM simulations The results from simulations were then compared to experimental results This study is mainly concentrate on crack propagation and rolling contact fatigue life due to the effect of austenite and compressive residual stress Research Approach

plastic deformation In this investigation the presence of compressive residual stresses increase the total fatigue life and reduces the FCGRs In addition stress ratio effect on fatigue behavior was studied Keywords Fatigue crack Compressive residual stress Al-alloy notch stress ratio 1 Introduction

On the premise of only considering along-wind effect on guyed mast the influence of welding residual stress on the fatigue life of welded joints is evaluated in this paper Since the sum of residual stress and along-wind-induced dynamic stress exceeds the yield strength of structural steel the effect of residual stress relaxation is included in the numerical analysis

2015-11-28The fine alumina blasting had very little effect on the residual stress levels whereas the glass bead peening gave the largest effect with a maximum residual compressive stress of 1GPa The effect of shot peening as an additional process on top of the initial cleaning processes was also investigated (see Figure 4)

Investigating the effect of retained austenite and

2019-1-9austenite and compressive residual stresses on rolling contact fatigue through XFEM simulations The results from simulations were then compared to experimental results This study is mainly concentrate on crack propagation and rolling contact fatigue life due to the effect of austenite and compressive residual stress Research Approach

2014-5-20The presence of residual stresses is difficult if not impossible to avoid irrespective of the production method There are many studies which show that surface tensile residual stresses are detrimental to the fatigue life of engineering components while surface compressive residual stresses

2009-1-31Residual Stresses: Their Causes and the Effective Means of Treatment to Reduce the Residual Stresses and to Improve the Fatigue Life in Engineering Components By J S Hornsey of Vibratory Stress Relieving (Africa) cc January 2006

2008-3-26In other words assumption is made that compressive-compressive cases (both max and min stresses are compressive) don't create fatigue damage I'm aware that in some cases local compressive yielding could produce residual tensile stress and on that way promote failure of parts which are loaded only in compression

2019-1-9austenite and compressive residual stresses on rolling contact fatigue through XFEM simulations The results from simulations were then compared to experimental results This study is mainly concentrate on crack propagation and rolling contact fatigue life due to the effect of austenite and compressive residual stress Research Approach

The fatigue life tests carried out on two groups of ball bearings confirm the positive influence of the compressive residual stresses induced by a previous loading in the elastic-plastic domain The values of residual stresses are numerically evaluated by employing a three

2016-6-29showed that fatigue life improvement resulting from shot peening can be attributed to the maximum residual stress and also to the depth of the plastically deformed layer A correlation was found between the fatigue life and the area under the residual stress curve In general fatigue crack initiation occurs on the speci-men surface

2017-10-19Fatigue cracks nearly always initiate and propagate normal to applied tensile stresses To improve fatigue life residual stresses that are oriented such that they reduce the principal applied tensile stress will provide the best benefit Residual stresses operating on orientations near the applied stress orientation will still

Modelling of Residual Stress Relaxation: A Review

2015-1-21Nevertheless the beneficial effects on fatigue life still remain because the relaxation is a partial relaxation of the compressive residual stress THERMAL RELAXATION Leverant et al (1979) found approximately 20% of the relaxation of the residual stresses induced by Shot Peening on Ti-6Al-4V caused by 600 F (316C) thermal exposure alone

2018-12-21normal but at the low pulse energy there were large amount of compressive residual stress in material as shown in Fig 7(a)(b) They also considered the effect of pulse energy on fatigue life and concluded that by reducing pulse energy fatigue life of material is also reduce respectively Table 1 laser peening condition [15] Pulse energy (mJ)

Welding residual stresses can have a substantial effect on the fatigue life of the weld Residual stresses are usually assumed to be high and tensile in order to ensure a conservative life prediction [BS7608 1993] The fatigue lives of welded structures are therefore assumed to be

Initial residual stress measurements obtained from the welded specimens revealed that residual stresses near the weld toe#8212 the location of fatigue crack initiation and final failure#8212 were compressive in the overwhelming majority of measurement cases It is widely accepted that compressive residual stresses are beneficial in fatigue

The benefits of residual compressive stresses to enhance fatigue strength in metallic components have long been recognized 1-4 Many engineering components have been shot-peened or cold worked with fatigue strength enhancement as the primary objective Beneficial surface compression may also be

2018-2-24The effect of monotonic compressive loading on the residual stresses developed at cold expanded fastener holes has been investigated using the neutron and X-ray diffraction techniques Monotonic loading models the effect of the peak of a fatigue loading sequence experienced before a crack is initiated

2017-9-27Effect of residual stresses produced by prestretching (tensile overload) on fatigue strength and fatigue notch factor of specimens of 4340 steel with two different notches and at two hardness levels The residual stresses eliminated the notch effect almost completely Note that with the residual stresses induced by stretching the worst

2018-2-24The effect of monotonic compressive loading on the residual stresses developed at cold expanded fastener holes has been investigated using the neutron and X-ray diffraction techniques Monotonic loading models the effect of the peak of a fatigue loading sequence experienced before a crack is initiated

2015-10-12of human life and money Distribution of residual stresses has an effect on this kind of failure Cold rolling operation were developed compressive residual stress in the surface of the specimen and improved the fatigue life endurance limit significantly