Experimental–computational estimation of rough fracture surface contact stresses

1998 ◽  
Vol 249 (1-2) ◽  
pp. 1-6 ◽  
Author(s):  
D.A Mendelsohn ◽  
T.S Gross ◽  
R.U Goulet ◽  
M Zhouc
Keyword(s):  
Fracture Surface ◽  
Contact Stresses ◽  
Computational Estimation ◽  
Rough Fracture ◽  
Surface Contact

scholarly journals The influence of fracture surface contact in fatigue crack propagation of material having texture under Mode II loading

2018 ◽  
Vol 13 ◽  
pp. 1088-1092
Author(s):  
Taro Suemasu ◽  
Motomichi Koyama ◽  
Shigeru Hamada ◽  
Masaharu Ueda ◽  
Hiroshi Noguchi
Keyword(s):  
Fatigue Crack ◽  
Fracture Surface ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Mode Ii ◽  
Surface Contact ◽  
Mode Ii Loading

scholarly journals DETERMINISTIC ANALYTICAL MODEL OF RESISTANCE TO DEEP CONTACT FATIGUE OF A STRESSED MATERIAL

2021 ◽  
Vol 3 (56) ◽  
pp. 52-60
Author(s):  
Sergei P. RUDENKO ◽  
◽  
Sergei G. SANDOMIRSKI ◽  
Keyword(s):  
Surface Layer ◽  
Stress State ◽  
Analytical Model ◽  
Structural Characteristics ◽  
Contact Fatigue ◽  
Contact Stresses ◽  
Radius Of Curvature ◽  
Tangential Stresses ◽  
Surface Contact ◽  
Tooth Surfaces

The stress state of the surface layer in the contact zone of the mating teeth of cylindrical gears is considered. It is shown that under contact loading, the stress state of the surface layer is inhomogeneous and changes with the distance from the surface. It is established that the value of the equivalent tangential stresses does not depend on the standard size of the gears, but is determined by the surface contact stresses σH. Moreover, the depth of occurrence of the maximum equivalent tangential stresses depends on the gear modulus (the reduced radius of curvature of the mating surfaces of the teeth) and, to a lesser extent, on the surface contact stresses σH. The inhomogeneity of the stress state and the structural characteristics of the diffusion layers of surface-hardened gears is a prerequisite for the appearance of critical zones in them, in which fatigue processes of contact failure can originate and develop. A deterministic analytical model of the resistance to deep contact fatigue of hardened tooth surfaces is proposed, based on determining the service life of the gear before the appearance of progressive deep contact chipping of the active tooth surfaces with a regulated variation of the microhardness values in different zones of the diffusion layer.

The Bending and Surface Contact Stress Variations in a Mating Plastic Gear Pair

2007 ◽  
Author(s):  
Ah-Der Lin ◽  
Jao-Hwa Kuang
Keyword(s):  
Dynamic Model ◽  
Plastic Material ◽  
Frictional Coefficient ◽  
High Sensitivity ◽  
Spur Gear ◽  
Contact Stresses ◽  
Gear Pair ◽  
Surface Contact ◽  
Influence Of Temperature On ◽  
Plastic Gears

A dynamic model of an engaging spur gear pair is proposed to study the distributions and variation of bending and surface contact stresses around the fillet and contacting points for plastic gears. The parameters used in this dynamic model include time-varying mesh stiffness, frictional coefficient, and profile-shifted factor, etc. Due to high sensitivity to heat for plastic material, the influence of temperature on plastic gears has also been taken into consideration in this work. A computational algorithm is developed to simulate the variation of fillet bending and surface contact stresses during the engagement with different speeds. The results indicate that the operating temperature may affect the distribution and the magnitude of bending and surface contact stresses of a plastic gear pair significantly.

Fixed Bearing Knee Congruency – Influence on Contact Mechanics, Abrasive Wear and Kinematics

2009 ◽  
Vol 32 (4) ◽  
pp. 213-223 ◽  
Author(s):  
Thomas M. Grupp ◽  
Dave Stulberg ◽  
Christian Kaddick ◽  
Allan Maas ◽  
Bernhard Fritz ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Contact Mechanics ◽  
Wear Behavior ◽  
Element Model ◽  
Contact Stresses ◽  
Fixed Bearing ◽  
Wear Rates ◽  
Surface Contact ◽  
Total Knee

The objective of our study was to evaluate the in vitro wear behavior of fixed bearing designs for total knee arthroplasty in relation to contact mechanics and resultant kinematics for different degrees of congruency. A finite element model was created for three knee articulations with increasing degrees of tibio-femoral congruency (flat, curved, and dished design). For the three different knee design configurations, in vitro wear simulation was performed according to ISO 14243–1. Contact areas increased with increasing knee congruency, whereas the peak surface contact stresses decreased. The wear rates for the knee design configurations differed substantially between the three test groups (flat, curved, and dished). Our observations demonstrate that increased congruency in conjunction with decreased surface contact stresses significantly contributes to reducing wear in fixed bearing knee articulations.

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