Sara Withers's Exotic Beads : 45 Distinctive Beaded Jewelry Designs PDF

By Sara Withers

ISBN-10: 0801987482

ISBN-13: 9780801987489

Now readers can the best way to make subtle, professional-looking jewellery with readily-available fabrics. complicated and targeted designs are provided in appealing colour pictures followed through whole, step by step directions. contains entire fabrics lists.

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Its baseline Density 17,6 penetration into RHA steel is 160 Hardness 423 Hv30 mm for an impact velocity of Yield stress 980 MPa 1500 m/s. Ultimate stress 1150 MPa It is nominally fired at 1500 m/s from a 44 mm bore diameter gun Elongation 9% based on a 40 mm L 70 Bofors tube and fitted with a 105 mm HM2 breech. For the tests, the gun was put at 61 m from the target. The impact velocity was measured by two optical barriers. The total yaw angle was calculated from the trace of the fins in paraffin cardboard put at regular intervals close to the target.

The change of impedance at this layer gives rise to a strong tensile reflection into the ceramic which acts to shatter the ceramic layer and to provide energy for ejection of the shattered material. In addition to this, a strong shear wave is set up at the interface which serves to ‘unzip’ the adhesive interface. An example of such shear ‘unzipping’ can be seen in Figure 2, where concentric bands of shear failure of the toughened epoxy adhesive layer can be seen. Very few adhesive materials exist with an acoustic impedance close to that of metals or ceramics.

Tungsten carbide ceramics exhibited high mechanical properties and had a great deal of applications on the civilian and the military markets. This kind of ceramic was thus chosen for further investigations. Table I. Physical and mechanical properties of various high density ceramics. 22 Longitudinal wave velocity (m/s) 6754 4810 -4450 -6900 6900 Ceramic Armor Materials by Design SANDVIK TUNGSTEN CARBIDE CERMETS The French material is a tungsten carbide ceramic with a low content of cobalt. The cobalt is used as a binder to process WC cermet at lower pressure and temperature as compared to pure WC ceramic.

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Exotic Beads : 45 Distinctive Beaded Jewelry Designs by Sara Withers


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