By Roshdy George S Barsoum
Recent investigations into blast-resistant homes of polyureas and different multi-phase polymeric elastomers point out that they could fritter away extensive bands of frequencies similar to these encountered in blast occasions. during this specified booklet, Elastomeric Polymers with excessive fee Sensitivity, Dr. Roshdy Barsoum and specialist members assemble the state-of-the-art trying out methodologies, fabric homes, and significant layout info for engineers trying to set up this expertise.
Where traditional tools of resisting blast, shockwave, and penetration are pricey, time-consuming and impractical, high-strain price elastomeric polymers (HSREP) may be more affordable, swifter, and extra simply utilized to new and previous fabrics alike. This booklet aids either army and civilian engineers in a number functions, from constructions and tunnels to light-weight armor, ships, and aircraft.
The publication beneficial properties constitutive types for software program builders designing with those complicated polymers, in addition to a dialogue of the mechanisms of interplay among high-strain cost polymers and different fabrics. It additionally completely covers HSREP engineering tips on how to in achieving different distinct houses, corresponding to fireproofing.
- Material homes and layout info incorporated to permit engineers to effectively installation this technology
- Cheaper, swifter, and extra simply applied than conventional equipment of accelerating blast and ballistic performance
- A how-to advisor to the engineering of excessive pressure fee elastomeric polymers to accomplish different important homes, reminiscent of fireproofing
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Additional info for Elastomeric polymers with high rate sensitivity : applications in blast, shockwave, and penetration mechanics
Another difference between PSPI and SPSPI is that in PSPI experiments the shear wave arrives after the longitudinal wave reverberates to reach an equilibrium compressive stress state. However, in an SPSPI experiment, both the longitudinal wave and shear wave begin to load the sample at the same time. Therefore, the beginning part of the shear deformation in the sample is under increasing compressive stress. 4. 13. 5 ms is the unloading wave arriving from the free surface of the flyer (and of the anvil in Shot 1301).
When voids or cracks are created at the “spall plane”, a compressive stress wave propagates back to the free surface and increases the normal velocity. 19) is therefore referred to as the “failure” point. The stress at this time corresponds to a critical tensile strength under conditions of uniaxial strain. 26, indicates that the normal stress at “failure” is 106 MPa. 20, “failure” does not correspond to “spall” in that the sample is not separated at the “spall plane”. 20, is a photograph of a recovered target sample.
6 t–X diagram for a pressure-change PSPI experiment. 7 shows the measured normal velocity and transverse velocity of two pressure- change experiments. Points B and B’ on the normal velocity curves correspond to the arrival of longitudinal waves reflected initially from the free surface of the rear plate. 6) reflected at the sample/rear-plate interface. The unloading wave causes the stress in the sample to re- 23 verberate down to the same stress state as that in the front and rear plates. 1). 8.