scholarly journals DYNAMIC MICRO-TESTING OVER A LARGE RANGE OF STRAIN RATES FOR HOMOGENOUS AND HETEROGENEOUS LOCAL MATERIAL CHARACTERIZATION

2019 ◽  
Author(s):  
FRANK HUBERTH ◽  
JOERG LIENHARD ◽  
BALAJI RAGUPATHI ◽  
MAX HAUBER
Keyword(s):  
Material Characterization ◽  
Large Range ◽  
Strain Rates ◽  
Local Material

Response of Various Metals to Large Torsional Strains Over a Large Range of Strain Rates—Part 1: Ductile Metals

1983 ◽  
Vol 105 (1) ◽  
pp. 42-47 ◽  
Author(s):  
G. R. Johnson ◽  
J. M. Hoegfeldt ◽  
U. S. Lindholm ◽  
A. Nagy
Keyword(s):  
Large Range ◽  
High Strain ◽  
Strain Rates ◽  
Test Results ◽  
Ductile Metals ◽  
Positive Strain ◽  
Lower Strain ◽  
Torsional Test ◽  
Shear Strains ◽  
Nickel 200

This paper presents torsional test results for six ductile metals subjected to large shear strains and high strain rates. Included are OFHC copper, Cartridge brass, Nickel 200, Armco IF iron, Carpenter electrical iron, and 1006 steel. Torsional shear strains as high as 700 percent are achieved and strain rates vary from quasi-static to over 300 s−1. At the lower strain rates all of the materials exhibit positive strain hardening and strain rate hardening under essentially isothermal conditions. At the higher strain rates there is significant adiabatic thermal softening and strong evidence for shear instabilities and localizations. Constitutive relationships are derived from the test data and finite element computations of the tests are performed.

Concrete under High Strain Rates: Local Material and Global Structure Response to Impact Loading

2011 ◽  
Vol 2 (3) ◽  
pp. 283-293 ◽  
Author(s):  
Birgit Beckmann ◽  
Anja Hummeltenberg ◽  
Tony Weber ◽  
Manfred Curbach
Keyword(s):  
Impact Loading ◽  
High Strain ◽  
Global Structure ◽  
Strain Rates ◽  
High Strain Rates ◽  
Structure Response ◽  
Local Material

Response of Various Metals to Large Torsional Strains Over a Large Range of Strain Rates—Part 2: Less Ductile Metals

1983 ◽  
Vol 105 (1) ◽  
pp. 48-53 ◽  
Author(s):  
G. R. Johnson ◽  
J. M. Hoegfeldt ◽  
U. S. Lindholm ◽  
A. Nagy
Keyword(s):  
Large Range ◽  
High Strain ◽  
Tungsten Alloy ◽  
Strain Rates ◽  
Test Results ◽  
Low Alloy Steel ◽  
Ductile Metals ◽  
Torsional Test ◽  
Shear Strains ◽  
Strain Rate Hardening

This paper presents torsional test results for six metals subjected to large shear strains and high strain rates. Included are 2024-T351 aluminum, 7039 aluminum, low alloy steel, S-7 tool steel, tungsten alloy and DU-.75Ti (Depleted Uranium). The specimens are strained to fracture at strain rates from quasi-static to over 100 s−1. All of the materials exhibit strain hardening and strain rate hardening. At the higher strain rates some of the materials develop shear instabilities and localizations. Constitutive relationships are derived from the test data and finite element computations of the tests are performed.

Designing Electronic Card Packages Against Shipping Shock

2021 ◽  
Vol 64 (1) ◽  
pp. 42-49
Author(s):  
Christine Taylor ◽  
Budy Notohardjono ◽  
Suraush Khambati ◽  
Shawn Canfield
Keyword(s):  
Product Design ◽  
Material Characterization ◽  
Design Stage ◽  
Strain Rates ◽  
Foam Material ◽  
Element Analysis ◽  
Product Failure ◽  
Packaging Design ◽  
Reasonable Approximation ◽  
Electronic Assemblies

Abstract In optimizing packaging design, the product’s fragility is qualified by a protype undergoing quantitative and qualitative tests that rely heavily on past knowledge and experiments. By the addition of finite element analysis (FEA), the product’s fragility can be obtained in the initial stages of product design with material characterization and simulation. FEA can predict Gs on the product as well as examine the strains, which interpret product failure more easily in the design stage. To incorporate FEA, first the foam material was measured at various strain rates under compression. Next a shipping package containing an Al block with consistent density was dropped at different heights—610 mm (24”), 915 mm (36”), and 1067 mm (42”)—to confirm the methodology. An I/O book was packaged for the final demonstration incorporating FEA with an electronic card package. In an electronic card package, the electronic assemblies are sensitive to strains on the system board. If the strains on the board are high, the assemblies’ solder connections to the board could be damaged and result in a defect during shipment. The simulations’ predicted Gs and board strains were compared to experimental drop testing results at 610 mm (24”) and 915 mm (36”). The simulation results for each sensor location were within reasonable approximation of the experimental results, verifying that FEA could be used in the initial design stages to predict the accelerations and strains for packaging development in parallel to the product design.

scholarly journals Elasto-visco-plastic modeling of mild steels for sheet forming applications over a large range of strain rates

2013 ◽  
Vol 50 (16-17) ◽  
pp. 2691-2700 ◽  
Author(s):  
Jean-Marc Pipard ◽  
Tudor Balan ◽  
Farid Abed-Meraim ◽  
Xavier Lemoine
Keyword(s):  
Large Range ◽  
Sheet Forming ◽  
Strain Rates
Sign in / Sign up

Export Citation Format

Share Document