An Optimization Design of Contact Interface Material Stiffness for Improving the Uniformity of the Contact Pressure

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Qiyin Lin ◽  
Nan Yang ◽  
Jun Hong ◽  
Lian Liu ◽  
Yuhan Zhang
Keyword(s):  
Contact Pressure ◽  
Contact Surface ◽  
Optimization Design ◽  
Contact Theory ◽  
Contact Interface ◽  
Design Algorithm ◽  
Stiffness Optimization ◽  
Material Stiffness ◽  
Stiffness Design ◽  
The Relationship

Abstract Material stiffness, a significant parameter of a contact interface, is investigated to improve the uniformity of the contact pressure. A contact interface material stiffness optimization design algorithm is developed based on the modified solid isotropic material with the penalization (SIMP) method. The uniformity of the contact pressure field is represented by its variance and is defined as the optimization objective. A node-to-node frictionless elastic contact theory is adopted to perform the contact analysis. The effectiveness of the interface material stiffness design for improving the uniformity of the contact surface is verified based on two contact cases. Because the relationship between the material stiffness and the hard-and-soft degree of a contact interface is always a positive correlation, the results in this paper could be extended so that the design of the contact interfaces’ hard-and-soft degree will improve the distributing uniformity of the contact surface.

Bi-objective optimization design of material stiffness for improving contact interface performances

2020 ◽  
pp. 095440622097543
Author(s):  
Yicong Zhou ◽  
Qiyin Lin ◽  
Jun Hong ◽  
Nan Yang
Keyword(s):  
Contact Pressure ◽  
Contact Area ◽  
Optimization Design ◽  
Variable Stiffness ◽  
Contact Interface ◽  
Stiffness Optimization ◽  
Material Stiffness ◽  
Effective Contact ◽  
Stiffness Design ◽  
Distribution Uniformity

The characteristics of contact interfaces such as the distribution uniformity of the contact pressure and the effective contact area play a crucial role in engineering equipment. To investigate the influences of the variable material stiffness optimization (VMSO) design on the contact characteristics of the contact interfaces in an assembly, an heuristic-based VMSO algorithm is developed in this paper. A bi-objective function is defined by including both the distribution uniformity of the contact pressure and the effective contact area. A single bolted joint model is adopted as a design example. The results indicate that optimizing the stiffness of the materials around the contact interface is an effective approach to enhance the distribution uniformity of the contact pressure, increase the effective contact area and decrease the maximum contact pressure. Furthermore, the improvement effectiveness provided by the proposed variable stiffness design is better than that provided by the traditional variable thickness design.

Precision Analytic Algorithms on Contact Stiffness of Parts

2012 ◽  
Vol 271-272 ◽  
pp. 1067-1072
Author(s):  
Fei Wan ◽  
Guo Xi Li ◽  
Zhi Hua Rao
Keyword(s):  
Dynamic Characteristics ◽  
Contact Surface ◽  
Contact Stiffness ◽  
Fractal Theory ◽  
Contact Theory ◽  
Cross Linking ◽  
Surface Model ◽  
Hertz Contact ◽  
Hertz Contact Theory ◽  
The Relationship

The couplings join the various parts together to form an assembly through contact surface, which the stiffness plays an important role for the machine characteristics. Hertz contact theory constructed the relationship between preload and stiffness from a macro perspective, while MB fractal theory presented the mapping between preload and stiffness from microscopic viewpoint. A more precise contact surface model about load and stiffness is established through learning from each other and cross-linking to prepare for analyzing the whole dynamic characteristics.

The Effect of Contact Morphology on Initiation and Propagation of Micro-Slip at Contact Interface

2004 ◽  
Author(s):  
Koshi Adachi ◽  
Koji Kato ◽  
Jun Liu ◽  
Hiroshi Kawamura
Keyword(s):  
Contact Surface ◽  
Slip Distribution ◽  
Partial Slip ◽  
Visualization Method ◽  
Contact Interface ◽  
Initiation And Propagation ◽  
Spherical Ball ◽  
The Relationship

In order to understand the mechanisms of micro-slip initiation and propagation at the contact interface, a visualization method of partial micro-slip at the contact interface was developed. The process of micro-slip initiation and propagation at the contact interface was successfully observed, and the relationship between tangential coefficient and partial slip distribution at the contact interface was analyzed by using the newly developed method. It was clarified that the partial slip distribution was affected by contact morphologies such as spherical ball, triangular stamp, rectangular stamp and concave stamp contact. The effect of uneven area of the contact surface on the micro-slip initiation and propagation was also clarified. It is confirmed from observed results that the visualization of the partial slip at the contact interface is useful for understanding the mechanism of the micro-slip initiation and the propagation at the contact interface.

Estimation of Gear Friction Coefficient using Directional Parameter of Tooth Surface

2021 ◽  
pp. 1-27
Author(s):  
Junichi Hongu ◽  
Ryohei Horita ◽  
Takao Koide
Keyword(s):  
Friction Coefficient ◽  
Contact Surface ◽  
Gear Tooth ◽  
Correction Term ◽  
Tooth Surface ◽  
Oil Film ◽  
Tooth Surfaces ◽  
Frictional Coefficients ◽  
Finishing Processes ◽  
The Relationship

Abstract This study proposes a modification of the Matsumoto equation using a directional parameter of tooth surfaces to adapt various gear finishing processes. The directional parameters of a contact surface, which affect oil film formations, have been discussed in the field of tribology; but this effect has been undetermined on the meshing gear tooth surfaces having directional machining marks. Thus, this paper investigates the relationship between the gear frictional coefficients and the directional parameters (based on ISO25178) of their tooth surfaces with the various finishing processes; and modifies the Matsumoto equation by introducing a new directional parameter to augment the various gear finishing processes. Our findings indicate that through optimizing the coefficient of the correction term the include the new directional parameter, the calculated friction values using the modified Matsumoto equation correlate more highly to the experimental friction values than that using the unmodified Matsumoto equation.

Approximate Analytical Model for Hertzian Elliptical Wheel/Rail or Wheel/Crossing Contact Problems

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
F. D. Fischer ◽  
M. Wiest
Keyword(s):  
Contact Pressure ◽  
Contact Problems ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Technical Accuracy ◽  
Elliptical Contact ◽  
Current Approximation ◽  
Analytical Expressions ◽  
Maximum Contact ◽  
Hertzian Contact Theory

The Hertzian contact theory is approximated according to a concept by Tanaka (2001, “A New Calculation Method of Hertz Elliptical Contact Pressure,” ASME J. Tribol., 123, pp. 887–889) yielding simple analytical expressions for the elliptical semi-axes, the maximum contact pressure, the mutual approach and the contact spring constant. Several configurations are compared using the exact Hertz theory and the current approximation. The results agree within technical accuracy.

A Map Complexity Measure Based on Contact Surface

2013 ◽  
Vol 411-414 ◽  
pp. 1994-1997
Author(s):  
Yan Li ◽  
Wen Ju Zhao ◽  
Zhen Hua Zhou
Keyword(s):  
Contact Surface ◽  
Hamming Distance ◽  
Measurement Methods ◽  
Complexity Measure ◽  
Connectivity Map ◽  
Complexity Measures ◽  
The Relationship

This paper defined the full connect map and contact surface, and proposed a new map complexity measure, and compared with measurement methods based on Hamming distance and relative Hamming distance. We further research on the relationship between the complexity measure and the map connectivity. The complexity measures based on Hamming distance and contact surface are applicable to full connectivity map, and the new measurement can reflects the difficulty of the pathfinding algorithm more accurately, especially in a higher complexity.

Optimization Design of Feeding Unit of the Forward Type Flute Laminating Machine

2013 ◽  
Vol 312 ◽  
pp. 106-109
Author(s):  
Run Xie ◽  
Ji Fei Cai ◽  
Jia Cong Chen
Keyword(s):  
Contact Surface ◽  
High Speed ◽  
Optimization Design ◽  
Servo Motor ◽  
Pile Up ◽  
Feeding Process

For paper forward unit of the current forward type flute laminating machine, the contact surface of the paper forward unit may damage paper during high speed paper forwarding. In view of this phenomenon, a solution is proposed through the study on the feeding unit of the flute laminating machine. In this paper, the corresponding sprocket driveshaft is controlled by a servo motor to slowly forward paper at the beginning and accelerate its forwarding speed gradually, until the entire feeding process is completed. In this way, the problem of paper pile-up and damages during the paper forwarding process can be solved, while matching backing paper feeding, so as to improve the feeding accuracy of the full-automatic flute laminating machine and hence its laminating accuracy.

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