Collision Response of a Cutting Energy Absorber and Its Application to Crashworthiness of Metro Trains

2019 ◽  
Author(s):  
Jiangfeng Ding ◽  
Xiaorui Wang
Keyword(s):  
Energy Absorber ◽  
Cutting Energy ◽  
Collision Response

Mechanical Energy Absorbers and Aluminum Honeycomb

1982 ◽  
Vol 104 (3) ◽  
pp. 671-674 ◽  
Author(s):  
J. A. Kirk
Keyword(s):  
Metal Cutting ◽  
Mechanical Energy ◽  
Energy Absorber ◽  
Cutting Energy ◽  
Aluminum Honeycomb ◽  
Velocity Effect ◽  
Energy Absorbers ◽  
Long Stroke ◽  
Honeycomb Material ◽  
Crush Strength

In this paper general equations for a replaceable element energy absorber are presented. For long stroke application (1 m or more) a metal cutting energy absorber is preferred. For shorter stroke applications crushing of aluminum honeycomb material is suggested. To evaluate the usefulness of aluminum honeycomb, as an energy absorber, a drop test apparatus was designed and built. Results suggest two effects, a geometry (“size”) effect and an impact velocity effect, cause the dynamic crush strength of the honeycomb to be different than static crush strength values. Experimentally the net effect causes less then 20 percent difference between static and dynamic crush strengths at extrapolated impact velocities of 50–100 m/s (164–328 ft/s).

Milling Parameter Selection to Lower Specific Cutting Energy During Machining of Alloy Steels

2020 ◽  
Author(s):  
Sudeep Kumar Singh ◽  
Adarsha Arijit Sahoo ◽  
Biswojit Pattnayak ◽  
Biswo Bhushan Tarai ◽  
A.M. Mohanty
Keyword(s):  
Parameter Selection ◽  
Specific Cutting Energy ◽  
Cutting Energy ◽  
Alloy Steels

scholarly journals Design and Numerical Simulation of a Ball Cutting Type Energy Absorber Device

2021 ◽  
Vol 1802 (4) ◽  
pp. 042076
Author(s):  
Zhiqing Hu ◽  
Liming Guo ◽  
Yuheng Zhang
Keyword(s):  
Numerical Simulation ◽  
Energy Absorber

Dynamic Analysis and Configuration Design of a Two-Component Wave-Energy Absorber

2012 ◽  
Author(s):  
Christophe Cochet ◽  
Ronald W. Yeung
Keyword(s):  
Wave Energy ◽  
Degrees Of Freedom ◽  
Outer Cylinder ◽  
Rigid Body Dynamics ◽  
Contact Forces ◽  
Energy Extraction ◽  
Energy Absorber ◽  
Compound Cylinder ◽  
Motion Study ◽  
Heave Motion

The wave-energy absorber being developed at UC Berkeley is modeled as a moored compound cylinder, with an outer cylinder sliding along a tension-tethered inner cylinder. With rigid-body dynamics, it is first shown that the surge and pitch degrees of freedom are decoupled from the heave motion. The heaving motion of the outer cylinder is analyzed and its geometric proportions (radii and drafts ratios) are optimized for wave-energy extraction. Earlier works of Yeung [1] and Chau and Yeung [2,3] are used in the present heave-motion study. The coupled surge-pitch motion can be solved and can provide the contact forces between the cylinders. The concept of capture width is used to characterize the energy extraction: its maximization leads to optimal energy extraction. The methodology presented provides the optimal geometry in terms of non-dimensional proportions of the device. It is found that a smaller radius and deeper draft for the outer cylinder will lead to a larger capture width and larger resulting motion.

Ground and flight test results for a decelerator towline energy absorber

1971 ◽  
Vol 8 (4) ◽  
pp. 423-425 ◽  
Author(s):  
EARL L. COUNCILL ◽  
ROSS L. GOBLE
Keyword(s):  
Flight Test ◽  
Test Results ◽  
Energy Absorber

Comparison of Rotary and Linear Cutting Methodology in Determining Specific Cutting Energy of Granite

2021 ◽  
pp. 1-19
Author(s):  
Aamer Kazi ◽  
Yi-Tang Kao ◽  
Bruce Tai
Keyword(s):  
Linear Method ◽  
Cutting Speed ◽  
Polycrystalline Diamond ◽  
Specific Cutting Energy ◽  
Cnc Machine ◽  
Cutting Method ◽  
Cutting Energy ◽  
The Difference ◽  
Geothermal Drilling ◽  
Chip Load

Abstract Single polycrystalline diamond compact (PDC) cutting is a practical technique to understand the rock-tool interactions in drag-bit type geothermal drilling operations. This paper introduces a rotary cutting method to determine specific cutting energy (SCE) and compares it with the conventional linear cutting method. In this work, granite is selected to represent hard rock formations in geothermal drilling. Cutting tests are conducted on a CNC machine with a realistic cutting speed of 12.7 m/min and several chip loads ranging from 0.08 to 0.25 mm. The cutting force is measured using a dynamometer, and then converted to SCE. The results show that the rotary method produces an inverse relationship between SCE and chip load, whereas the linear method shows the opposite. As a result, the produced SCE by the rotary method tends to be lower than that of the linear method at a higher chip load at and over 0.16 mm. The difference may be attributed to the cutting configuration and associated force components.

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