Propagation of combined longitudinal and torsional stress waves in a functionally graded thin-walled tube

2021 ◽  
Author(s):  
Shitang Cui ◽  
Xiaojun Ni
Keyword(s):  
Stress Waves ◽  
Functionally Graded ◽  
Torsional Stress ◽  
Thin Walled Tube ◽  
Thin Walled

scholarly journals Deformation of a Thin-walled Tube of Softened Celluloid under Cyclic Torsional Stress with Superimposed Constant Axial Stress

1984 ◽  
Vol 27 (233) ◽  
pp. 2323-2331 ◽  
Author(s):  
Hisaaki TOBUSHI ◽  
Yutaka NARUMI ◽  
Yoshio OHASHI ◽  
Wakatomi NAKANE
Keyword(s):  
Axial Stress ◽  
Torsional Stress ◽  
Thin Walled Tube ◽  
Thin Walled

NICROBRAZ 50

Alloy Digest ◽  
1994 ◽  
Vol 43 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Honeycomb Structures ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Low Solubility

Abstract NICROBRAZ 50 is a low-melting, free-flowing filter metal for honeycomb structures and thin-walled tube assemblies. It has low solubility. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-460. Producer or source: Wall Colmonoy Corporation.

scholarly journals Optimal Design of the Shape of a Non-Ball Mandrel for Thin-Walled Tube Small Radius Cold Bending

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1221
Author(s):  
Lu Bai ◽  
Jun Liu ◽  
Ziang Wang ◽  
Shuanggui Zou
Keyword(s):  
Ideal Point ◽  
Small Radius ◽  
Grey Wolf Optimizer ◽  
Forming Quality ◽  
Hollow Section ◽  
Cold Bending ◽  
Bending Process ◽  
Before And After ◽  
Thin Walled Tube ◽  
Thin Walled

In the field of cold bending, it is necessary to use ball mandrels, especially to bend thin-walled tubes with a small radius. However, the bending process with a ball mandrel is complex and expensive, and it is easy to jam the core ball inside the tube. To solve these issues, we designed two kinds of hollow non-ball mandrel schemes with low stiffness that were suitable for the small radius bending of thin-walled tubes. We evaluated the forming quality of cold bending numerically and the influence of the hollow section length and thickness on the forming indices. Our results showed that the thickness of the hollow section has a greater influence on forming quality than the length. As the hollow section’s thickness increased, the wrinkling rate first declined by approximately 40% and then increased by above 50%. When the thickness was 11 mm in scheme 1 and 13 mm in scheme 2, the wrinkling rate reached minimum values of 1.32% and 1.50%, respectively. As the hollow section’s thickness increased, the flattening rate decreased by more than 60% and the thinning rate increased by about 40%. A multi-objective optimization of forming indices was carried out by ideal point method and grey wolf optimizer. By comparing the forming results before and after optimization, the feasibility of using the proposed hollow mandrel was proved, and the hollow mandrel scheme of standard cylinder is therefore recommended.

scholarly journals Cold Forging Effect on the Microstructure of Motorbike Shock Absorbers Fabricated by Tube Forming in a Closed Die

2021 ◽  
Vol 11 (5) ◽  
pp. 2142
Author(s):  
Trung-Kien Le ◽  
Tuan-Anh Bui
Keyword(s):  
Material Flow ◽  
Cold Forging ◽  
Technological Parameters ◽  
Forming Process ◽  
Tube Forming ◽  
Shock Absorbers ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Quality Of Products ◽  
Forming Defects

Motorbike shock absorbers made with a closed die employ a tube-forming process that is more sensitive than that of a solid billet, because the tube is usually too thin-walled to conserve material. During tube forming, defects such as folding and cracking occur due to unstable tube forming and abnormal material flow. It is therefore essential to understand the relationship between the appearance of defects and the number of forming steps to optimize technological parameters. Based on both finite element method (FEM) simulations and microstructural observations, we demonstrate the important role of the number and methodology of the forming steps on the material flow, defects, and metal fiber anisotropy of motorbike shock absorbers formed from a thin-walled tube. We find limits of the thickness and height ratios of the tube that must be held in order to avoid defects. Our study provides an important guide to workpiece and processing design that can improve the forming quality of products using tube forming.

A top-down approach making cellulose carbonaceous aerogel/MnO2 ultrathick bulk electrodes with high mass loading for supercapacitors

2021 ◽  
Author(s):  
Weiye Zhang ◽  
Yanchen Li ◽  
Beibei Wang ◽  
Jingmeng Sun ◽  
Lin Lin ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Mass ◽  
Mass Loading ◽  
Top Down ◽  
Thin Walled Tube ◽  
Natural Wood ◽  
Thin Walled ◽  
Array Structure

A cellulose carbonaceous aerogel/MnO2 ultrathick electrode with a unique low curvature, porous carbon thin-walled tube array structure was obtained from natural wood using a simple top-down approach.

Investigation on the influence of mandrel on the forming quality of thin-walled tube during free bending process

2021 ◽  
Vol 72 ◽  
pp. 215-226
Author(s):  
Cheng Cheng ◽  
Hao Chen ◽  
Jiaxin Guo ◽  
Xunzhong Guo ◽  
Yuanji Shi
Keyword(s):  
Forming Quality ◽  
Bending Process ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Free Bending

A modified Marciniak–Kuczynski model for determining the forming limit of thin-walled tube extruded with initial eccentricity

2019 ◽  
Vol 151 ◽  
pp. 715-723 ◽  
Author(s):  
Zhubin He ◽  
Zhibiao Wang ◽  
Yanli Lin ◽  
Haihui Zhu ◽  
Shijian Yuan
Keyword(s):  
Forming Limit ◽  
Thin Walled Tube ◽  
Thin Walled

Bubbles effect on sound dispersion in thin-walled tube with polymeric liquid and elastic central rod

2011 ◽  
Vol 330 (13) ◽  
pp. 3155-3165 ◽  
Author(s):  
S.P. Levitsky ◽  
R.M. Bergman ◽  
J. Haddad
Keyword(s):  
Polymeric Liquid ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Sound Dispersion
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