Paper 54: Creep Torsion of Prismatic Bars

Gubser, John L.; Sidebottom, O. M.; Shammamy, M. R.

doi:10.1243/pime_conf_1963_178_028_02

Cited by 10 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the calculation of stresses in circular tubes the thin-wall approximation may be considered adequate for thickness-to-radius ratios up to one-tenth. For straight-sided tubes equivalent accuracy is obtained for ratios up to only one-twentieth, where the effective radius is defined as in 'eq (13). These criteria are applicable under creep conditions as well as under elastic conditions.…”

Section: Discussionmentioning

confidence: 99%

“…For elasti c torsion of square or recta ngular tubes th e situation is not as favorable. If a mean radius for straight-sided tubes is defined by 2A rm = p (13) and if the stress concentrations at the corner s are neglected, then the maximum shear stress at the outer surface is [24,31] Therefore,…”

Section: A Stress Gradientmentioning

confidence: 99%

“…A. E. Johnson [6][7][8][9][10] has probably done more work in this field than anyone else and, indeed, with the exception of one related investigation [11], Johnson was the only researcher of record engaged in torsion creep studies between 1940 and 1960. Recently , however, there has developed a mounting internation al interest in the subject as evidenced by the appearance of six papers [12][13][14][15][16][17] in the last three .years. This is attributable, in part at least, to anticipated creep defor mation problems in the wings of supersonic aircraft.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Torsion creep of circular and noncircular tubes

Mordfin¹

1967

J. RES. NATL. BUR. STAN. SECT. C. ENG. INSTR.

View full text Add to dashboard Cite

A torsio n creep theory for nonc ircula r tubes was developed by applying a multiaxial creep theory to a derived ge neraHzation of Bredt's equations.A review of the literature revealed no torsion creep data on noncircular tubes. Hence, to evalu ate the theory , a tes t program was carried out on twelve specimens of aluminum alloy st ructural tubing, of four confi guration s, at 400 O F.Observed discrepancies betwee n the torsion creep th eory and experiment are smaller than variation s in the meas ured c reep properties of th e specim en material from one tube configuration to another and are not appreciably greater than di scre pan cies bet wee n elastic torsion theory and experiment. Most of the observed discrepan cies are consistent with meas ured anisotropy in the tubes, while other di sc repancies are ascribed to nonhomogeneity in creep properties and a hyd rostati c stress effect in multiaxj a l c reep.For the calc ulation of torsion stresses in ci rcu lar tubes the thin-wall approximation is adequate for thick ness-to-radiu s ratios up to one-tenth. F or strai ght -s id ed tubes equ ivalen t accuracy is obtained for effective ratios up to only one-twentieth. These c rite ria apply to creep conditions as well as to elasti c co ndition s.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: A Stress Gradientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Torsion creep of circular and noncircular tubes

Mordfin¹

1967

J. RES. NATL. BUR. STAN. SECT. C. ENG. INSTR.

View full text Add to dashboard Cite

show abstract

“…In an earlier treatment of the problem of laminar radial flow bet ween parallel plates, Hunt and Torbe 3 employed an approach which was similar to the one used by Savage in the paper under discussion. The starting point was to assume a series expansion for u of the form u = -g,(z) + g2(z) + -T: ffs(z) r r 1 r*…”

Section: Laminar Radial Flow Betweenmentioning

confidence: 99%

“…They have been intensively studied (Ref. [11] of the paper) and are known to follow equation (1) closely. Fig.…”

mentioning

confidence: 99%

Discussion: “A Direct-Stress Analysis of Orthotropic Cantilever Plates” (Coull, A., 1965, ASME J. Appl. Mech., 32, pp. 67–70)

Nash

1965

Journal of Applied Mechanics

View full text Add to dashboard Cite

discussion these members at 75 min. The error ill the predicted deformations at 75 min by this theory ranged from 100 to 400 percent. It is the writer's opinion that theories based on equation (4) deserve considerable consideration. The theory is equally valid for members made of plastics or metals (at elevated temperature). Multiaxial creep theories based on equation (4) can be derived with reasonable ease. The resulting theories are independent of the properties of the material so that design curves can be constructed for a given load-carrying member. The theory is no more complex for members subjected to variable loads than for constant loads. In case of variable loading, the creep properties are required for tension and compression specimens subjected to the same load history as the member to be designed. The magnitudes of

show abstract

Evaluation of multiaxial theories for room-temperature plasticity and elevated-temperature creep and relaxation of several metals

Sidebottom

1973

Experimental Mechanics

View full text Add to dashboard Cite

Paper 54: Creep Torsion of Prismatic Bars

Cited by 10 publications

References 1 publication

Torsion creep of circular and noncircular tubes

Torsion creep of circular and noncircular tubes

Discussion: “A Direct-Stress Analysis of Orthotropic Cantilever Plates” (Coull, A., 1965, ASME J. Appl. Mech., 32, pp. 67–70)

Evaluation of multiaxial theories for room-temperature plasticity and elevated-temperature creep and relaxation of several metals

Contact Info

Product

Resources

About