Some Aspects of the Dynamic Similarity in Metal Cutting

1967 ◽  
Vol 89 (3) ◽  
pp. 525-529
Author(s):  
Tao-Ching Hsu
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Metal Cutting ◽  
Strain Rate Effects ◽  
New Approach ◽  
Dimensionless Parameters ◽  
Dynamic Similarity ◽  
Rate Effects ◽  
Effects Of Temperature ◽  
Theoretical Considerations

A new approach to the mechanics of metal cutting is demonstrated by applying the principle of dynamic similarity to the plastic flow in the cutting process. In accordance with known effects of temperature and strain rate on the flow stress of materials, three dimensionless parameters are chosen by theoretical considerations, two for temperature distribution and one for strain rate effects. For convenience, a secondary set of dimensionless parameters is derived from the first. Nondimensional cutting force and non-dimensional stresses on the tool face are defined. Successful application of dimensional analysis to experimental results is presented.

Temperature and Strain Rate Effects on Mechanical Behavior of a PMMA

2007 ◽  
Vol 340-341 ◽  
pp. 1079-1084 ◽  
Author(s):  
Tao Suo ◽  
Yu Long Li ◽  
Yuan Yong Liu
Keyword(s):  
Flow Stress ◽  
High Strain Rate ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
High Strain ◽  
Strain Range ◽  
Testing Temperature ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Increasing Temperature

In this paper, the mechanical behavior of a PMMA used as the windshield of aircraft was tested. The experiments were finished under two quasi-static strain rates and a high strain rate with the testing temperature from 299K to 373K. The results show that the mechanical property of this PMMA depends heavily on the testing temperature. The Young’s modulus and flow stress were found to decrease with increasing temperature at low strain rate. At the strain rate of 10-1 1/s, strain softening was observed under all experiment temperatures. At high strain rate, with the temperature increasing, the flow stress decreases remarkably while the failure strain increases, and the strain soften was also observed at the temperature above 333K. Comparing the experiments results at same temperature, it was found the flow stress increases with the rising strain rate. The predictions of the mechanical behavior using the ZWT theoretical model have a good agreement with experimental results in the strain range of 8%.

Strain Rate Effects in Low Speed Two-Body Abrasion

1978 ◽  
Vol 100 (2) ◽  
pp. 181-184 ◽  
Author(s):  
J. Larsen-Basse ◽  
P. A. Tanouye
Keyword(s):  
Silicon Carbide ◽  
Flow Stress ◽  
Strain Rate ◽  
True Strain ◽  
Pure Aluminum ◽  
Plastic Work ◽  
Sliding Velocity ◽  
Strain Rate Effects ◽  
Dependent Part ◽  
Rate Effects

Specimens of pure aluminum, copper, and iron were abraded on silicon carbide abrasive papers. The sliding velocity was varied between 0.5 and 82 mm/s and a range of abrasive grit sizes was used. The cutting force is composed of a friction contribution, which accounts for 70–90 percent of the total, and a plastic work contribution. The plastic work contains a velocity-independent and a velocity-dependent contribution. The velocity-independent part is the work to deform the metal plastically to a true strain of approximately 5. The velocity-dependent part is relatively small and is proportional to the logarithm of the velocity. It is caused by the effect of strain rate on the flow stress. No effects of grit size alone on strain rate were found.

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