Rational test piece geometry for cyclic tension-compression tests on plastics

1972 ◽  
Vol 5 (5) ◽  
pp. 847-848
Author(s):  
P. P. Oldyrev
Keyword(s):  
Test Piece ◽  
Compression Tests ◽  
Cyclic Tension

A tension—compression testing machine

1971 ◽  
Vol 6 (3) ◽  
pp. 177-180 ◽  
Author(s):  
K J Pascoe
Keyword(s):  
Testing Machine ◽  
Hydraulic Cylinder ◽  
Compression Testing ◽  
Compression Tests ◽  
Stress Strain ◽  
Cyclic Tension

The machine is used for cyclic tension-compression tests on metallic specimens and incorporates a Dalby extensometer to give photographic stress-strain curves; loading is by a double-acting hydraulic cylinder, controlled manually by needle valves.

scholarly journals Characterization of Asphalt Mixes Behaviour from Dynamic Tests and Comparison with Conventional Cyclic Tension–Compression Tests

2018 ◽  
Vol 8 (11) ◽  
pp. 2117 ◽  
Author(s):  
Jean-Claude Carret ◽  
Hervé Di Benedetto ◽  
Cédric Sauzéat
Keyword(s):  
Compression Test ◽  
Complex Modulus ◽  
Axial Stress ◽  
Viscoelastic Model ◽  
Compression Tests ◽  
Dynamic Tests ◽  
Asphalt Mixes ◽  
Cyclic Tension ◽  
Methods Of Analysis ◽  
Linear Viscoelastic

In the presented research, conventional cyclic tension–compression tests and dynamic tests were performed on two types of asphalt mixes (AM). For the tension–compression tests, the complex modulus was obtained from the measurements of the axial stress and axial strain. For the dynamic tests, an automated impact hammer equipped with a load cell and an accelerometer were used to obtain the frequency response functions (FRFs) of the specimens at different temperatures. Two methods were proposed to back-calculate the complex modulus from the FRFs at each temperature: one using the 2S2P1D (two springs, two parabolic elements and one dashpot) model and the other considering a constant complex modulus. Then, a 2S2P1D linear viscoelastic model was calibrated to simulate the global linear viscoelastic behaviour back calculated from each of the proposed methods of analysis for the dynamic tests, and obtained from the tension–compression test results. The two methods of analysis of dynamic tests gave similar results. Calibrations from the tension–compression and dynamic tests also show an overall good agreement. However, the dynamic tests back analysis gave a slightly higher value of the norm of the complex modulus and a lower value of the phase angle compared to the tension–compression test data. This result may be explained by the nonlinearity of AM (strain amplitude is at least 100 times smaller for dynamic tests) and/or by ageing of the materials during the period between the tension–compression and the dynamic tests.

Bauschinger Effect Exhibited in Advanced High Strength Steel Sheets under Cyclic Tension and Compression Tests

2014 ◽  
Vol 626 ◽  
pp. 561-565
Author(s):  
Heng Kuang Tsai ◽  
Fuh Kuo Chen ◽  
Shi Wei Wang
Keyword(s):  
Finite Element ◽  
High Strength Steel ◽  
Bauschinger Effect ◽  
High Strength ◽  
Compression Tests ◽  
Advanced High Strength Steel ◽  
Steel Sheets ◽  
Cyclic Tension ◽  
Experimental Apparatus ◽  
Tension And Compression

The Bauschinger effect exhibited in the advanced high strength steel sheets was examined by conducting cyclic tension-compression tests. The experimental device for performing the cyclic tension and compression tests with a single sheet specimen was developed in the present study. The experimental apparatus consists of a novel constraint jig that could prevent the sheet specimen from buckling during the compression test. The efficiency of the developed clamping device was validated by both the finite element analysis and the cyclic tension and compression tests conducted in the present study. The test results reveal that the advanced high strength steel exhibits significant Bauschinger effect. It is also confirmed that the finite element prediction of springback present in the stamping of advanced high strength steel sheets is more consistent with the experimental results if the Bauschinger effect is considered.

Experimental Observation of Correlation Between Creep and Uniaxial Ratchetting of Sn∕37Pb and Sn∕3Ag∕0.5Cu Solder Alloys

2006 ◽  
Vol 129 (1) ◽  
pp. 82-89 ◽  
Author(s):  
Katsuhiko Sasaki ◽  
Takuji Kobayashi ◽  
Ken-ichi Ohguchi
Keyword(s):  
Creep Deformation ◽  
Empirical Method ◽  
Time Dependent ◽  
Lead Free ◽  
Compression Tests ◽  
Solder Alloys ◽  
Creep Tests ◽  
Cyclic Tension ◽  
Reliability Of Solder Joints ◽  
Free Solder

Time-dependent deformations such as creep and ratchetting of solder alloys are significant deformation phenomena that need to be understood to ensure the safety and reliability of solder joints in electronic packaging. There is much research on creep deformation of solder alloys, but ratchetting deformation, especially the correlation between creep and ratchetting deformation of solder alloys has not been investigated. This paper discusses the correlation between creep and uniaxial ratchetting deformation to establish the differences in the time-dependent deformation of lead-free and lead-containing solder alloys. Uniaxial ratchetting tests were conducted by cyclic tension–compression tests or cyclic tension–unloading tests at several ratios of the maximum to minimum stresses. Additional creep tests following the uniaxial ratchetting were also conducted to observe the effect of the uniaxial ratchetting on creep deformation. An empirical method to select an optimal lead-free solder alloy is discussed by defining a uniaxial ratchetting strain rate. The additional creep tests also show that the uniaxial ratchetting deformation has a strong correlation to the creep deformation and that the correlation is different for lead-free and lead-containing solder alloys.

Study of Aluminum Alloy 7050 T7451 Isotropic Hardening

2016 ◽  
Vol 869 ◽  
pp. 526-531
Author(s):  
Rodrigo Mendes Lima ◽  
Ernesto Massaroppi Jr.
Keyword(s):  
Aluminum Alloy ◽  
Stress State ◽  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Isotropic Hardening ◽  
Compression Tests ◽  
Plastic Deformations ◽  
Fem Simulations ◽  
Nonlinear Constitutive Model ◽  
Cyclic Tension

This paper presents the yielding surface isotropic hardening study of the aluminum alloy 7050 T7451 submitted to monotonic loadings, considering the nonlinear constitutive model proposed by Voce. The stress state imposed characterizes a behavior whose plastic deformations cannot be neglected. The analysis depends on the segregation between the isotropic and the kinematic hardening that composes the material’s behavior during its transient life. Monotonic and cyclic tension-compression tests have been realized in order to allow the Bauschinger Effect understanding. The results have been compared to FEM simulations in order to validate the model.

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

Dislocations in alumina deformed by prismatic slip

1978 ◽  
Vol 36 (1) ◽  
pp. 606-607
Author(s):  
J. Cadoz ◽  
J. Castaing ◽  
J. Philibert
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Basal Slip ◽  
Prismatic Slip ◽  
Compression Tests ◽  
Thin Sections ◽  
Burgers Vector ◽  
Maximum Deformation ◽  
Transmission Electron ◽  
Mechanical Thinning

Plastic deformation of alumina has been much studied; basal slip occurs and dislocation structures have been investigated by transmission electron microscopy (T.E.M.) (1). Non basal slip has been observed (2); the prismatic glide system <1010> {1210} has been obtained by compression tests between 1400°C and 1800°C (3). Dislocations with <0110> burgers vector were identified using a 100 kV microscope(4).We describe the dislocation structures after prismatic slip, using high voltage T.E.M. which gives much information.Compression tests were performed at constant strainrate (∿10-4s-1); the maximum deformation reached was 0.03. Thin sections were cut from specimens deformed at 1450°C, either parallel to the glide plane or perpendicular to the glide direction. After mechanical thinning, foils were produced by ion bombardment. Details on experimental techniques can be obtained through reference (3).

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