Modeling of Load Frequency Effect on Fatigue Life of Thermoplastic Composites

1999 ◽  
Vol 33 (12) ◽  
pp. 1141-1158 ◽  
Author(s):  
X. R. Xiao
Keyword(s):  
Fatigue Life ◽  
Thermoplastic Composites ◽  
Frequency Effect ◽  
Load Frequency

scholarly journals An Extended Model for Fatigue Life Prediction and Acceleration Considering Load Frequency Effect

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 21064-21074 ◽  
Author(s):  
Yikun Cai ◽  
Yu Zhao ◽  
Xiaobing Ma ◽  
Zhenyu Yang ◽  
Ying Ding
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Frequency Effect ◽  
Extended Model ◽  
Load Frequency

scholarly journals Mechanical and Tribological Behaviour of Hybrid Multi Fibre Reinforced Nylon 6-6 Nanocomposites

2021 ◽  
Vol 58 (3) ◽  
pp. 137-147
Author(s):  
Pradeep Kumar Seethakaran ◽  
Gopalakrishnan Prabhakaran ◽  
Paulraj Jawahar
Keyword(s):  
Wear Resistance ◽  
Fatigue Life ◽  
Glass Fibre ◽  
Research Work ◽  
Nylon 6 ◽  
Wire Mesh ◽  
Thermoplastic Composites ◽  
Nano Silica ◽  
Tribological Behaviour ◽  
Load Impact

The investigation on the effect of adding silane modified chopped E-glass fibre and Aluminium metal wire-mesh into nano silica toughened nylon 6-6 thermoplastic composites on mechanical, drop load impact, fatigue and tribological behaviour is studied in this paper. The primary aim of this research work is to develop a hybrid Nylon 6-6 nanocomposites having high stiffness, toughness and wear resistance. The chopped glass fibre and Al wire-mesh was surface treated with the help of 3-Aminopropyletrimethoxylane (silane) and acid etching. The tensile results revealed that additions of glass fibre and Al mesh into nano - silica toughened nylon 6-6 composite gives improved tensile and flexural strength. Similarly, the Izod impact strength of Al-mesh reinforced nano silica (1vol.%) toughened nylon 6-6 gives superior energy absorption up to 6 Joules/cm. The drop load impact penetration of composite N3 (59% - Nylon 66, 20% - E-glass fibre, 20% - Al wire mesh and 1 % - nano silica) shows very limited penetration than other composites. Highest fatigue life of 16391 cycles was observed for the composite designated N3, which contains 1 vol.% of nano silica, whereas the composite containing 2 vol.% of nano silica gives very lower specific wear rate and Co-efficient of friction. The developed composite which has better modulus, stiffness, wear resistance and fatigue life could be possibly used in automobile power transmission gears, domestic equipment and farm related machineries.

Development of a High Cycle Fatigue Life Prediction Model for Thin Film Silicon Structures

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Chia-Cheng Chang ◽  
Sheng-Da Lin ◽  
Kuo-Ning Chiang
Keyword(s):  
Thin Film ◽  
Fatigue Life ◽  
Life Prediction ◽  
Microelectromechanical Systems ◽  
Fatigue Testing ◽  
Mesh Size ◽  
Prediction Equation ◽  
Frequency Effect ◽  
Element Analysis ◽  
Solution Type

The fatigue characteristics of microelectromechanical systems (MEMS) material, such as silicon or polysilicon, have become very important. Many studies have focused on this topic, but none have defined a good methodology for extracting the applied stress and predicting fatigue life accurately. In this study, a methodology was developed for the life prediction of a polysilicon microstructure under bending tests. Based on the fatigue experiments conducted by Hocheng et al. (2008, “Various Fatigue Testing of Polycrystalline Silicon Microcantilever Beam in Bending,” Jpn. J. Appl. Phys., 47, pp. 5256–5261) and (Hung and Hocheng, 2012, “Frequency Effects and Life Prediction of Polysilicon Microcantilever Beams in Bending Fatigue,” J. Micro/Nanolithogr., MEMS MOEMS, 11, p. 021206), cantilever beams with different dimensions were remodeled with mesh control technology using finite element analysis (FEA) software to extract the stress magnitude. The mesh size, anchor boundary, loading boundary, critical stress definition, and solution type were well modified to obtain more correct stress values. Based on the new stress data extracted from the modified models, the optimized stress-number of life curve (S–N curve) was obtained, and the new life-prediction equation was found to be referable for polysilicon thin film life prediction under bending loads. After comparing the literature and confirming the new models, the frequency effect was observed only for the force control type and not for the displacement control type.

Frequency Effect of Torsion on Rotating Bending Fatigue Behavior of Gas Tungsten Arc (GTA) Welded AISI 1018 and AISI 4140 Welded Joints

2018 ◽  
Author(s):  
Saad Aziz ◽  
Ahmet Eren ◽  
Muhammad A. Wahab
Keyword(s):  
Fatigue Life ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Fatigue Behavior ◽  
Frequency Effect ◽  
Gas Tungsten Arc ◽  
Aisi 4140 ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fatigue Life Reduction

Fatigue failures of welded structure are subjected to occur due to multiaxial fatigue load and torsion. In the current research work, the frequency effect of torsion on rotating bending fatigue load is analyzed on AISI 1018 steel and AISI 4140 steel. To perform rotating bending torsional fatigue test of welded and un-welded specimens, a unit was designed and manufactured. Gas Tungsten Arc (GTA) welding was carried out on round bar of AISI 1018 steel and AISI 4140 steel welded using ER70-S2 filler metal for welded specimen. Later, the influence of torsional frequency on rotating bending with torsion is analyzed on both base metal and welded structures. The frequency of torsion was applied on the specimens were - 500 cycle, 1000 cycle, 1500 cycle, 2000 cycle and 2500 cycle. From the analysis, fatigue life of AISI 1018 and AISI 4140 base metal specimens (rotating bending and torsion) were not affected when torsion was applied at different frequencies. However, fatigue behavior of welded AISI 1018 and AISI 4140 specimens were highly affected by the frequency of torsion. For torsion applied at every 500 cycles, 83.8% reduction of fatigue life was observed for AISI 1018 welded specimen with respect to AISI 1018 base metal specimens. In addition, torsion applied for every 1000, 1500, 2000, and 2500 cycles; 81.9%, 80%, 77.1%, and 72.4% reduction on fatigue life were observed for AISI 1018 welded specimen compare to AISI 1018 base metal specimens, respectively. Welded AISI 4140 specimens experienced less change in fatigue life compare to welded AISI 1018 specimens. For torsion applied at every 500 cycles, 73.9% fatigue life reduction was observed for welded AISI 4140 specimens compare to AISI 4140 base metal specimens. For torsion applied at every 1000, 1500, 2000, and 2500 cycles; 65.2%, 60.8%, 50%, and 43.5% fatigue life reduction occurred on welded AISI 1018 specimen. Moreover, hardness measurements for welded specimens of AISI 4140 and AISI 1018 were performed longitudinally. For welded AISI 1018 specimen, 14.8% and 9.7% hardness decrease was observed longitudinally compare to AISI 1018 base metal specimen at heat-affected zone (HAZ) and from heat-affected zone through weld zone, respectively. For welded AISI 4140 specimen, 26.3% reduction of hardness value was observed compare to AISI 4140 base metal through heat-affected zone for longitudinal analysis. Moreover, fracture surface analysis was performed on the welded and non-welded specimens to understand the fracture behavior.

Load frequency dependence in fatigue life or nitrided steel

1983 ◽  
Vol 17 (8) ◽  
pp. 979-981 ◽  
Author(s):  
K. Ishizaki ◽  
L.H. Corredor ◽  
G.O. Fior
Keyword(s):  
Fatigue Life ◽  
Frequency Dependence ◽  
Load Frequency ◽  
Nitrided Steel
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