Tensile strength increase

Tensile Strength. Fillers of small particle size and large surface area increase the tensile strength of a mbber compound. For most fillers, tensile strength increases with loading to an optimum value after which it decreases with increased loading. 

C depending on the nature of the X group. An additional feature of these polymers is that their tensile strengths increase after heat treatment due... 

Increased water resistance Increased tensile strength Increased block resistance Increased solvent resistance Increased adhesion to hydrophilic surfaces... 

Greater amounts of copper increase the proportion of needles or stars of Cu Sn in the microstmcture. Increase in antimony above 7.5% results in antimony—tin cubes. Hardness and tensile strength increase with copper and antimony content ductiUty decreases. Low percentages of antimony (3—7%) and copper (2—4%) provide maximum resistance to fatigue cracking in service. Since these low alloy compositions are relatively soft and weak, compromise between fatigue resistance and compressive strength is often necessary. 

Most metals lose their ductility and impac t strength at low temperatures, although in many cases yield and tensile strengths increase as the temperature goes down. 

Figure 11.7 shows how the mechanical properties of normalised carbon steels change with carbon content. Both the yield strength and tensile strength increase linearly with carbon content. This is what we would expect the FejC acts as a strengthening phase, and the proportion of FojC in the steel is linear in carbon concentration (Fig. 11.6a). The ductility, on the other hand, falls rapidly as the carbon content goes up (Fig. 11.7) because the a-FejC interfaces in pearlite are good at nucleating cracks.

Fiber/matrix Coupling agent Tensile strength Increase in properties [%] Young s Compression modulus strength Impact energy... 

Aside from type of claim (fiber dominant or interfacet matrix dominant), the efficiency of surface treatments depends noticeably on the fiber content within the composite. At a fiber content of 30 vol%, tensile strength increases by 10% and shear strength increases by about 100% (Fig. 12). In contrast to modified fibers where shear strength rises with increasing fiber content, the chart, after having reached a maximum, shows a... 

ZnO nanoparticles possess greater surface/volume ratio. When used in carboxylated nitrile rubber as curative, ZnO nanoparticles show excellent mechanical and dynamic mechanical properties [41]. The ultimate tensile strength increases from 6.8 MPa in ordinary rabber grade ZnO-carboxylated nitrile rubber system to 14.9 MPa in nanosized ZnO-carboxylated nitrile mbber without sacrificing the elongation at failure values. Table 4.1 compares these mechanical properties of ordinary and nano-ZnO-carboxylated nitrile rubbers, where the latter system is superior due to more rubber-ZnO interaction at the nanolevel. 

PBT is used for textile applications due to its stretchability, increased crystallinity and improved dyeability. It is introduced in the production of carpets and stretchable fabrics, where a certain degree of elasticity is desired. PBT is used preferably for the production of engineering plastics due to its combination of dimensional stability, tensile strength, increased flexibility and fast crystallization rate. 

Tensile strength increases by 34% when the temperature decreases from 20°C down to -20°C. 

When determined relatively soon after placement, reported shear bond strengths of glass-ionomers are of the order of 3-7 MPa [213,220], However, because the material fails cohesively, this is actually a measure of the tensile strength. As the cement matures, the tensile strength increases, and failure rates in clinical service are very low [221],... 

Polyvinyl nitrate [Structure (2.6)], originally thought to be a replacement for NC (at least partly), had been explored by a number of groups [1-3] who concluded that the propellants based on PVN (on replacement of NC by PVN) have the properties comparable heat of explosion and burning rate, decreased tensile strength, increased elongation and pressure exponent (n) and hence PVN is not acceptable as a replacement of NC [4]. 

Ethylene in the polymer provides softness to the product and is low cost. However, the softness in the product often comes at the expense of its wet tensile strength. Increasing the level of self crosslinkable monomer in the polymer often is not a viable option to increase the wet tensile strength. 

Mechanical Properties. Because PVDC is difficult to fabricate into suitable test specimens, very few direct measurements of its mechanical properties have been made. Some characteristic properties of high VDC content, unplaslicized copolymers are listed in Table 3. The performance of a given specimen is sensitive to morphology, including the amount and kind of crystallinity, as well as orientation. Tensile strength increases willi crystallinity, whereas toughness and elongation decrease. Orientation, however, improves all three properties. 

---