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compressive instability

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Published: 01 January 2000
) Homogenous compression, when L / D < 2.0 and no friction is present at the contact surfaces. (f) Compressive instability due to work-softening material More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003265
EISBN: 978-1-62708-176-4
.... uniaxial compression testing compression test subscale testing mechanical behaviour deformation axial compression testing stress-strain behaviour metallic materials compressive properties plasticity plastic deformation ductile fracture compressive instability buckling medium-strain-rate...
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Published: 01 January 2000
Fig. 9 Considére construction showing instability conditions in tension testing (due to decreasing work-hardening rate) and in compression testing (due to work softening) More
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Published: 01 January 2005
Fig. 9 Considére's construction showing point of instability in tension testing (due to decreasing strain-hardening rate) and in compression testing (due to strain softening) More
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Published: 01 January 2001
Fig. 7 Critical strength-check locations for a flat sandwich panel. A , bearing/bypass; B , flatwise tension and/or compression; C , core shear; D , face strength and instability; E , flexural core crushing More
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Published: 01 January 2002
Fig. 15 Crack initiation on type 316LR stainless steel dynamic compression plate. (a) Anterior-posterior radiograph. The plate was used to treat the nonunion of a fracture between the fourth and seventh screws. The plate was bent intraoperatively to fit the contour of the bone. (b) Radiograph More
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009009
EISBN: 978-1-62708-185-6
...”) plastic instabilities can develop in the compression test. Finally, metals become much more strain-rate sensitive at elevated temperature ( Ref 1 ). This makes strain-rate control in testing very important. Three forms of compression tests are discussed in this article: The cylindrical...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003388
EISBN: 978-1-62708-195-5
... the bag-side facesheet changes direction. The flatwise, or interlaminar, stresses are induced at the ramp radii. A flatwise tension stress can cause face-to-core debonding, while a flatwise compression stress can cause core crushing. Local Instability Local instability includes the following two...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004014
EISBN: 978-1-62708-185-6
..., thin longitudinal cross section, it may fail due to compressive plastic instability if it is flow formed in the backward direction ( Ref 1 ). Selection of forming direction depends on geometry, materials ductility, and the extent of reduction. The energy required for forming also influences...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003295
EISBN: 978-1-62708-176-4
...Abstract Abstract This article reviews the dynamic factors, experimental methods and setup, and result analysis of different types of high strain rate shear tests. These include high strain rate torsion testing, double-notch shear testing and punch loading, drop-weight compression shear testing...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003385
EISBN: 978-1-62708-195-5
... shear stiffness effects. The article presents the study of instability associated with postbuckling behavior and hygrothermal buckling in composite sandwich panels and shell panels. composites orthotropic plates anisotropic plates unsymmetric plates transverse shear stiffness postbuckling...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009007
EISBN: 978-1-62708-185-6
... machined into the specimens before compression, because the notches apparently cause more severe stress concentrations, thus providing a more reliable index of the workability to be expected in a complex forging operation. Plastic Instability in Compression Several types of plastic instabilities can...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004002
EISBN: 978-1-62708-185-6
... of compressive flow instabilities in the composites with an interconnected reinforcement architecture. It was noted that microstructural damage controlled the instability strain of interconnected composites tested at room temperature, while the low strain-hardening coefficient controlled the appearance of flow...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004017
EISBN: 978-1-62708-185-6
... workability tests, such as the tension test, ring compression test, plane-strain compression test, bend test, indentation test, and forgeability test. It concludes with information on the role of the finite-element modeling software used in workability analysis. bend test bulk forming processes...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009003
EISBN: 978-1-62708-185-6
... be: (Eq 3) e = L 1 − L 0 L 0 = Δ L L 0 = 1 L 0 ∫ L 0 L 1 d L If the bar had been compressed from an initial length L 0 to a shorter length L 1 , then the normal strain calculated from Eq 3 would have a negative sign...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003261
EISBN: 978-1-62708-176-4
...). The compression test is a convenient method for determining the stress-strain response of materials at large strains (ε > 0.5) because the test is not subject to the instability of necking that occurs in a tension test. Also, it may be convenient to use the compression test because the specimen is relatively...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005461
EISBN: 978-1-62708-196-2
... for use in finite-element analyses of deformation processing. The article reviews the Cockcroft-Latham criterion of fracture and its reformulated extension for analysing the fracture locus for compression. It concludes with information on fundamental fracture models. slab method upper-bound method...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005168
EISBN: 978-1-62708-186-3
... procedures for both continuum and crystal-plasticity mechanics are also discussed. The article also provides various examples that illustrate the simulation of aluminum sheet forming. aluminum alloy sheet metals aluminum sheet forming compressive instability continuum mechanics crystal-plasticity...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009008
EISBN: 978-1-62708-185-6
...Abstract Abstract A cylindrical specimen compressed with friction at the die surfaces does not remain cylindrical in shape but becomes bulged or barreled. Tensile stresses associated with the bulging surface make the upset test a candidate for workability testing. This article discusses test...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003379
EISBN: 978-1-62708-195-5
... ). The other two, brittle fracture and compressive instability , are limited to specific domains on the strain plane and become local truncations superimposed on the primary shear failure envelope, which is shown in Fig. 1 for isotropic glass fibers and in Fig. 2 for orthotropic carbon fibers. Fig...