Elastomeric polymers with high rate sensitivity : by Roshdy George S Barsoum

By Roshdy George S Barsoum

Recent investigations into blast-resistant houses of polyureas and different multi-phase polymeric elastomers point out that they could burn up vast bands of frequencies corresponding to these encountered in blast occasions. during this certain ebook, Elastomeric Polymers with excessive price Sensitivity, Dr. Roshdy Barsoum and specialist participants assemble the state of the art checking out methodologies, fabric homes, and significant layout information for engineers looking to install this expertise.

Where traditional tools of resisting blast, shockwave, and penetration are dear, time-consuming and impractical, high-strain price elastomeric polymers (HSREP) could be more cost-effective, swifter, and extra simply utilized to new and previous fabrics alike. This ebook aids either army and civilian engineers in a number purposes, from structures and tunnels to light-weight armor, ships, and aircraft.

The ebook positive aspects constitutive versions for software program builders designing with those complex 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 particular houses, resembling fireproofing.

  • Material houses and layout information integrated to permit engineers to effectively install this technology
  • Cheaper, faster, and extra simply applied than conventional tools of accelerating blast and ballistic performance
  • A how-to advisor to the engineering of excessive pressure cost elastomeric polymers to accomplish different precious houses, resembling fireproofing

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Example text

Pressure-change experiments are fit by curves. Data for two low-pressure experiments are represented by open circles for stress states at which the stresses vary slowly enough to be nominally uniform through the thickness of the respective samples. 28. 28. 07 GPa as the normal stress approaches zero. The dashed curve is for a pressure-change experiment on the material prepared at UCSD. 2, this material shows a knee in the velocity–time profile for the normal velocity, in the pressure-change experiment of Shot 709 the normal stress rings up fully to a plateau and, as the pressure decreases, the stress trajectory approaches a value comparable to that shown for the solid curve.

Data for two low-pressure experiments are represented by open circles for stress states at which the stresses vary slowly enough to be nominally uniform through the thickness of the respective samples. 28. 28. 07 GPa as the normal stress approaches zero. The dashed curve is for a pressure-change experiment on the material prepared at UCSD. 2, this material shows a knee in the velocity–time profile for the normal velocity, in the pressure-change experiment of Shot 709 the normal stress rings up fully to a plateau and, as the pressure decreases, the stress trajectory approaches a value comparable to that shown for the solid curve.

The height of each step can be used to calculate the stress level. The width of each step can be used to estimate the wave speed at a corresponding average stress level. 23. Experimental results are shown as solid squares. Each time step during the ring-up process is a round trip transit time of a weak shock wave propagating through the thickness of the sample. Because the change in entropy for a shock wave is proportional to the third power of the pressure increase, a weak shock produces little increase in entropy.

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