Results 251 to 260 of about 178,206 (308)

Wrinkling Limit in Tube Bending

Manufacturing Engineering, 2000
Abstract Thin-walled tube bending has found many of its applications in the automobile and aerospace industries. This paper presents an energy approach to provide the minimum bending radius, which does not yield wrinkling in the bending process, as a function of tube and tooling geometry and material properties.
Xi Wang, Jian Cao
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Optical measurement of tube bending

Precision Engineering, 1982
Abstract Tube boring is usually accompanied by checking the degree of bending. Optically, this is done by experienced operators using their visual acuity and ability to ascertain the distortions of circular images. This classical method, while fairly accurate, has poor resolution and requires a long period of training.
Fernando D. Carvalho, F.Carvalho Rodrigues, J.Pinto Chagas, L.E. Fabião, Isabel Bentes   +4 more
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TUBE BENDING RADIUS

2017
<div class="section abstract"> <div class="htmlview paragraph">This standard establishes basic design criteria including preferred bend radii, straight lengths between bends, flattening and surface conditions in the bend area. Also included is a table of preferred tubing sizes and wall thicknesses and a formula for determining a minimum ...
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Bending of lightweight circular tubes

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2017
The concept design (sizing) of thin-walled tubes subject to bending is dealt by resorting to rigorous design principles pertaining to engineering science. Multi-objective optimization is the proper theory that has been exploited. Minimum mass and maximum stiffness (minimum compliance) are the optimization objectives.
Mastinu, G., Previati, G., Gobbi, Massimiliano   +2 more
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On Finite Bending of Pressurized Tubes

Journal of Applied Mechanics, 1959
Abstract A unified treatment is presented of two well-known problems which have until now been considered separately. The two problems are: (a) the linear problem of pure bending of curved tubes, and (b) the nonlinear problem of pure bending of straight tubes. In both problems the effect of uniform internal pressure is included.
openaire   +2 more sources

Bending Instability of Composite Tubes

Journal of Aerospace Engineering, 1996
In this paper, a set of simple formulations is derived to predict the instability critical loads of orthotropic composite tubes under pure bending. The formulations are based on the assumption that the instability of an orthotropic composite tube under pure bending is due to the ovalization of its cross section.
openaire   +1 more source

Spatial shape prediction of multi-bends metal tube bending

2011 IEEE International Conference on Computer Science and Automation Engineering, 2011
Springback is one of the most important factors that affect the forming quality of tube bending. In this paper, the numerical simulation method was adopted to research on space shape of multi-bends metal tubes after springback. Based on the processing requirements, the springback and elongation of each bend was predicted through finite element ...
null Jia Meihui, Chengtong Tang, null Wang Wengang   +2 more
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Radii-Tube Bend, Metric

2017
<div class="section abstract"> <div class="htmlview paragraph">This standard defines criteria for acceptability of tube bends for hydraulic system metallic tubing.</div></div>
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Boiler Tube Cracked During Bending

2019
Abstract A seamless hot-drawn boiler tube NW 300 of 318 mm OD and 9 mm wall thickness made of steel 15Mo3 was bent with sand filling after preheating allegedly to 1000 deg C. In the process it had cracked repeatedly in the drawn fiber. The composition corresponded to specifications, but exceptionally high copper content was noticeable ...
Friedrich Karl Naumann, Ferdinand Spies
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Three-Dimensional Tube Geometry Control for Rotary Draw Tube Bending: Part 1—Bend Angle and Overall Tube Geometry Control

Manufacturing Engineering, 2000
Abstract Traditional trial-and-error springback compensation methods have the problems of high scrap rate, low efficiency, high cost of fixtures and operator experience dependency. The method presented in this paper uses on-line measured springback data from the same batch to predict and compensate for springback.
Huazhou Lou, Kim A. Stelson
openaire   +1 more source