Properties impact resistance

Impact properties Impact resistance Impact resistant PP IMP ATT device IMPATTs... 

Polycarbonates are used in optics, transparent technical parts, aesthetic applications and protection devices for their transparency, mechanical properties, impact resistance, rigidity, good creep behaviour, fatigue resistance, insulating properties, dimensional stability, low moisture uptake, broad range of service temperatures (-100°C up to -i-135°C),food contact and sterilization possibilities for suitable grades. 

This section examines the advantages and disadvantages of using three-dimensional textile preforms, especially through-the-thickness stitches, as the reinforcements for composites. Their major mechanical properties are compared with those of conventional two-dimensional composites, such as strength, stiffness, interlaminar properties, impact resistance and tolerance, etc. Dransfield et al. (1994) have recently given a useful review on the improvement of interlaminar fracture toughness of stitched composites. 

Regarding the properties required of the solidified materials in 2D printing, the most important properties are generally related to thin material layers, such as color, adhesion to the substrate, hghtfastness, and scratch resistance, whereas in 3D printing, the most important properties are generally related to the bulk material mechanical and thermomechanical properties, for example tensile and flexural properties, impact resistance, and Glass Transition Temperature (Tg). 

Reinforcing Fiber Mechanical Strength Electrical Properties Impact Resistance Corrosion Resistance Machining and Punching Heat Resistance Moisture Resistance Abrasion Resistance Low Cost Stiffness... 

Other properties impact resistance, wear and erosion behaviour... 

Impact resistance usually improves with increased processing stress (orientation), especially when the forming ratio approaches a value of one. When the film is produced with high, isotropic (balanced) uniaxial properties, impact resistance is usually maximized. Highly anisotropic film tends to be splitty , resulting in low impact values. 

Mechanical Reinforcing fiber strength Electrical properties Impact resistance Chemical resistance Machining and punching Heat resistance Moisture resistance Abrasion resistance Low cost Stiffness... 

An unaccelerated non-thixotropic, DTD approved, tough, orthophthalic resin offering excellent mechanical properties, impact resistance and electrical performance. Recommended for the manufacture of mouldings for land transport, marine and industrial application. Suitable for hand-lay, RTM, filament winding and pultrusion. 

Electrical relay components, relay bases, cases, and coil forms make use of a range of engineering thermoplastics, thermoplastic polyesters, nylons, polyphenylenes, LCPs, and thermoplastic pol5dmide Vespel TP can be used for underhood electrical applications due to its high temperature properties, impact resistance, and automotive chemical resistance. ... 

One of the most important properties—impact resistance—has been tested in various conditions of acceleration of the impact weight (acceleration being recorded on an oscilloscope). In this way, the falling rate, impact strength, and kinetic energy transmitted to the film can be calculated by the Gardner test [41, 42],... 

PE is used more than any other thermoplastic polymer. There is a wide variety of grades and formulations available that have an eqnally wide range of properties. In general, the outstanding characteristics of PE are toughness, ease of processing, chemical resistance, abrasion resistance, electrical properties, impact resistance, low coefficient of friction, and near-zero moisture absorption. 

If the above statements are correct, the additive should not affect most mechanical properties. Impact resistance may be an exception to some degree because it is sensitive to any imperfections in the material, and incompatible material may cause formation of such imperfections. 

Vitamin E stabilized and melted samples display the better oxidative stability. However, the stabilization by vitamin E is possible without changing the polymer morphology i.e. altering some of the other mechanical properties (impact resistance. Youngs modulus, fatigue crack resistance...). 

Despite the inevitable scatter due to the diversity of the sources, clear trends can be seen mechanical (tensile and flexural) properties, impact resistance as well as heat distortion temperature increase with higher fibers content. The improvement in impact resistance seems however to be maximum at around 0.18-0.20 fibers fraction, and damaged samples (i.e., notched) are considerably more fragile than intact ones Figure 7.12). 

---