Author
J.M. Lifshitz
Other affiliations: Bradley University
Bio: J.M. Lifshitz is an academic researcher from Technion – Israel Institute of Technology. The author has contributed to research in topics: Beam (structure) & Split-Hopkinson pressure bar. The author has an hindex of 8, co-authored 11 publications receiving 442 citations. Previous affiliations of J.M. Lifshitz include Bradley University.
Papers
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TL;DR: In this article, the effect on dynamic stress curve of dispersion and shifting of elastic strain pulses travelling in a split Hopkinson pressure bar is reported, and the dispersion correction is done in the frequency domain after employing FFT algorithm by adjusting the phase of each Fourier component.
208 citations
TL;DR: In this paper, three-layer sandwich beams, made of two elastic outer layers and a viscoelastic layer sandwiched between them, are considered as damping structural elements, and an equality constrained minimization algorithm is modified and used to obtain optimal design of damping sandwhich beams subjected to inequality design constraints.
76 citations
TL;DR: In this paper, a method for calculating stress and strain in non-symmetric filament-wound pressure vessels with thick metal liners, up to burst pressure, is presented based on classical laminate theory and Tsai-Wu failure criterion.
61 citations
TL;DR: In this paper, the interlaminar tensile strength and modulus of two material systems have been investigated experimentally at high strain rate, by the split Hopkinson bar technique and examined by dynamic finite element analysis performed by NASTRAN finite-element code.
53 citations
TL;DR: In this paper, a low velocity impact of carbon fiber reinforced epoxy (AS4/3502 by Hercules) was conducted with 48 and 40 layered beams of different combinations of 0°, 90°, 45° and −45° stacking sequences, and the acceleration pulse was analyzed in the frequency domain to determine the source of high frequency vibrations and a simple two-degrees-of-freedom model was used to distinguish between the force on the striker and the force applied to the beam.
31 citations
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475 citations
TL;DR: In this article, a large diameter split Hopkinson pressure bar (SHPB) was used to obtain the complete stress-strain relationship of the Bukit Timah granite at medium strain rate.
Abstract: A large diameter split Hopkinson pressure bar (SHPB) has been developed. This equipment is briefly described, together with a shaped striker that initiates a half-sine incident waveform to obtain the complete stress-strain relationship of the Bukit Timah granite at medium strain rate. Good constant strain rate was derived, and the dynamic complete stress-strain curves and energy absorption of the granite were measured at a strain rate between 20 and 60 per second. Repeated impact between 60–90% of the static strength of the granite was also conducted. Results from the tests show that the cumulative damage of the granite depends on the peak stress of the dynamic loads with a fixed duration. The dynamic fracture strength of the granite loaded at medium strain rate is directly proportional to the cube root of the strain rate. For the granite loaded at this strain rate, Young’s modulus is unchanged. Energy absorption of the samples loading to fragmentation determined its fragmented size distribution. At high strain rate, the rock possesses large energy absorption and the particle size of the fragments is much smaller.
378 citations
TL;DR: In this article, the authors investigated the thermomechanical behavior of glassy polymers (PC) deformed at strain rates ranging from 5000 to 8000 s ˇ1, and the temperature was assessed using small embedded thermocouples whose applicability to transient measurements has been recently revisited.
312 citations
TL;DR: In this article, an experimental investigation of strain rate effects on polymer-based composite materials is presented, where quasi-static and dynamic experiments at strain rates up to 350 s−1 were performed with end-loaded, rectangular off-axis compression and transverse compression specimens.
299 citations