High Rates and Impact Experiments

Ramesh, K.T.

doi:10.1007/978-0-387-30877-7_33

Cited by 213 publications

(97 citation statements)

References 112 publications

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“…Although a number of techniques have been developed to measure material properties at high strain rates, the splitHopkinson pressure bar [55][56][57][58], or Kolsky bar, has now become ubiquitous for materials characterization between 500 and 10 4 s -1 , or even higher if miniaturized systems are used [59,60]. A schematic of the split Hopkinson pressure bar system at the Air Force Research Laboratory, Eglin AFB, FL is shown in Fig.…”

Section: Dynamic Loading: Split Hopkinson Pressure Barmentioning

confidence: 99%

High Strain Rate Mechanics of Polymers: A Review

Siviour

Jordan

2016

J. dynamic behavior mater.

284

121

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The mechanical properties of polymers are becoming increasingly important as they are used in structural applications, both on their own and as matrix materials for composites. It has long been known that these mechanical properties are dependent on strain rate, temperature, and pressure. In this paper, the methods for dynamic loading of polymers will be briefly reviewed. The high strain rate mechanical properties of several classes of polymers, i.e. glassy and rubbery amorphous polymers and semi-crystalline polymers will be reviewed. Additionally, time-temperature superposition for rate dependent large strain properties and pressure dependence in polymers will be discussed. Constitutive modeling and shock properties of polymers will not be discussed in this review.

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Section: Dynamic Loading: Split Hopkinson Pressure Barmentioning

confidence: 99%

High Strain Rate Mechanics of Polymers: A Review

Siviour

Jordan

2016

J. dynamic behavior mater.

284

121

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“…In the following, a brief review is made comprising the particular challenges of failure prediction in the fields of creep, stress rupture, and fatigue, and the associated experimental approaches to assist in the understanding of failure for these load cases. Following the classification used by [110], strain rates below 10 À6 s À1 are considered to be creep loading and strain rates at or below 10 À3 s À1 are considered to represent quasi-static deformations. As an extension beyond the quasi-static range, strain rates above 10 2 s À1 are classified as high strain rates, strain rates above 10 4 s À1 are called very high strain rates, and strain rates above 10 6 s À1 are referred to as ultrahigh strain rates.…”

Section: Long-term Behaviormentioning

confidence: 99%

“…For even higher strain rates, impactors driven by gravity or projectiles shot by gas cannons are used to test materials subject to high-velocity impact. A good review on the recent developments of the experimental techniques in high-velocity testing is given by Ramesh [110] and a critical review of the Kolsky bars is given by Gama [175].…”

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confidence: 99%

Failure of Fiber-Reinforced Composites

Sause

2016

In Situ Monitoring of Fiber-Reinforced Composites

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“…Some tensile testing machines can produce strain rates of the order ̇= 10 0 −1 however, strain rates in the domain 10 0 −1 ≤ ̇≤ 10 2 −1 are notoriously difficult to study because resonance in the testing equipment and wave propagation in the sample become significant, as noted in Figure 3.11 [39] [40]. Tensile tests are easily performed using commercial research equipment that can apply a constant extension velocity to a specimen that creates an axial load [41] and measure this load with inbuilt load- The basic schematics of how this experiment is conducted is shown in Figure 3.12.…”

Section: Tensile Testingmentioning

confidence: 99%

“…A striker bar is fired at the input bar to create a compressive stress pulse that flows through the input bar into a cylindrical test specimen [38] [39]. Strain gauges are placed on the input and output bar to measure the incident pulse, the pulse reflected back to the input bar at the input/specimen boundary and the transmitted pulse that passed through the specimen/output bar boundary [39]. A stress-strain curve can be recreated from the time histories of the transmitted and reflected strains in the input and output bars, with the strain rate of the experiment being an average rate determined from the strain rate history of the experiment [39].…”

Section: Tensile Testingmentioning

confidence: 99%

Development of material strength and failure models for structural simulation of metallic shock tube diaphragms

Lacey¹

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Rupture dynamics of thin metallic diaphragms significantly influence the development of radially uniform planar shocks in hypersonic impulse facilities and consequently have a significant influence on the operating conditions of such facilities. Little literature exists for predicting the rupture pressure and opening times of diaphragms in impulse facilities and therefore there is interest among researchers in this field to develop characteristic models that describe mechanical properties of diaphragms during deformation and rupture. This thesis investigates a novel procedure for developing material models that describe plastic yielding and ductile rupture of thin metallic diaphragms using tensile testing equipment. Johnson-Cook strength and damage model constants have been determined from raw tensile data produced from tensile specimens of notched and un-notched geometries tested at a range of strain rates. The validity of the model constants produced was shown by comparing simulated load-displacement plots of tensile tests to data taken directly from such experiments. It was found that the models produced accurate predictions for specimens with geometries that introduced high stress concentrations at quasi-static speeds. Simulations of specimens without stress concentrations had over-predicted extensions at failure, and high strain rate simulations were impeded by experimental uncertainty in the strain rate dependent constants. To continue previous work in this field at the University of Queensland, a finite element model of 1/8 th of the diaphragm region of the X3 impulse facility was created and simulations performed. Mesh convergent simulations predicted a rupture pressure of 11.88 which was similar to the experimentally determined rupture pressure of 15 − 18 . Disagreement in results was attributed to uncertainty in damage constants due to measurement techniques, uncertainty in strain rate dependent constants due to experimental variation and an uncertainty in the exact rupture pressure at the diaphragm location in the X3 impulse facility.

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High Rates and Impact Experiments

Cited by 213 publications

References 112 publications

High Strain Rate Mechanics of Polymers: A Review

High Strain Rate Mechanics of Polymers: A Review

Failure of Fiber-Reinforced Composites

Development of material strength and failure models for structural simulation of metallic shock tube diaphragms

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