Compressive yield strength

AHoy no. Nominal composition, wt % Compressive Yield Strength, MPa Ultimate Brinell hardness... 

Cemented carbides possess high compressive strength but low ductihty at room temperature, but at temperatures associated with metal-cuttiag these materials exhibit a small but finite amouat of ductihty. Measuremeat of yield strength is therefore more appropriate at higher temperatures. Like hardness, the compressive yield strength of cemented carbide decreases monotonicaHy with increa sing temperatures. 

Common name UNS designation 0.5% Yield strength, MPa " Compressive yield strength, MPa " Tensile strength, MPa " Elongation in 5 cm, % Brinell hardness, 500-kg load Electrical conductivity, % lACS Thermal conductivity at 20°C, W/(m-K) ... 

Torsional Yield Strength of the Tool Joint Baaed on Tensile Yield Strength of the Pin and Compressive Yield Strength of the Box - Lowest Value Prevailing. 

Foam Density lb./ft.3 Glass Microballoons Epoxy Macroballoons Uniaxial Compressive Yield Strength, psi Hydrostatic Compressive Strength, psi Method of Preparation Resin System... 

Cured Epoxy Requirements. In order to comply with multiple needs identified above, the epoxy pot should have a compressive yield strength of greater than 9000 psi. In addition, for brackish and seawater applications an arbitrary specification of zero creep at 50°C at 1000 psi under seawater for 3000 hours has been established. Applications at higher temperatures would obviously demand a higher zero creep temperature. 

If up to 40% of ESI is blended with LDPE then foamed, the foam properties are closer to those of LDPE foams. Ankrah and co-workers (33) showed that the ESI/LDPE blends have slightly lower initial compressive yield strengths than the LDPE alone, allowing for the density of the foam. The temperature dependence of the yield stress is similar to that of LDPE foam (Figure 3). Although the yield stress is higher than EVA foam of the same density, the compression set values are lower. The ESI/LDPE foams have improved impact properties, compared with EVA foams of similar density. Analysis of creep tests shows that air diffuses from the cells at a similar rate to EVA foams of a greater density. 

The addition of particulate fillers generally decreases compression fatigue, but increases ultimate compressive modulus and compressive yield strength, because of a stiffening effect. Compressive strength as a function of filler loading is shown for a cured epoxy formulation in Fig. 9.7. 

Fig. 29. Elastic modulus, E, compressive yield strength, and strain softening (Acr /o vs. AN content for various SAN resins...

Limited results on not optimally processed Mo-Si-B alloys indicate that the brittle-to-ductile (B/D) transition temperature in tension is at temperatures > 1100°C. Compressive yield strength varies approximately linearly from 1500 MPa at room temperature to 400 MPa at 1370°C. Tensile fracture strengths below the B/D temperature are in the neighborhood of 600 MPa, and exhibit considerable microstructural sensitivity and large scatter. 

Alloys within Nb system are also brittle in tension up to 1000°C. They exhibit compressive yield strengths of 1600 MPa at room temperature, 1500 MPa at 800°C and then rapid drop to 600 MPa at 1000°C and 300 MPa at 1100°C. Below the B/D transition temperature, the tensile fracture strengths exhibit considerable scatter with average values of - 250 MPa. In both systems ffactography reveals that below the B/D transition temperature, the tensile fracture is initiated by large silicides or silicide agglomerates. 

The compressive strength is calculated by dividing the maximum compressive load by the original minimum cross-sectional area of the specimen. The compressive yield strength is calculated in the same manner, but instead of compressive load at break, the compressive load at the yield point is used. The compressive modulus of elasticity is calculated in the usual manner, by dividing the compressive stress taken as a point on the initial linear portion of the load-deformation curve by the corresponding strain. 

The candidate tool material must be able to withstand the compressive loads when the tool hrst makes contact with the workpiece and have sufh-cient compressive and shear strength at elevated temperature to prevent tool fracture or distortion for the duration of the friction stir weld. Currently, predicting the required tool strength requires complex computational simulations, so typically, the strength requirements are based on experience. At a minimum, the candidate tool material should exhibit an elevated- (workpiece solidus temperature) temperature compressive yield strength higher than the expected normal forces of the tool. 

The reduction in compressive modulus will have an effect on the compressive yield strength, as shown in Figure 12.23. The trend is different in that it is a continuous... 

Figure 17.11 Data from Jiang, B. and Weng, G.J. (2004) A theory of compressive yield strength of nano-grained ceramics , Int. J. Plasticity, 20, 2007.

Homo-PS is known to be brittle in tension at room temperature in unmodified form, as Fig. 13.3 demonstrates. It has a compressive yield strength of around 103 MPa that, with a substantial strength-differential effect, translates into a tensile yield strength of 73 MPa, and undergoes plastic flow if its brittleness can be suppressed. Experimental evidence, such as that in Fig. 13.3, shows that homo-PS undergoes brittle behavior initiated from surface flaws, and that elimination of these is impractical, primarily because, even if that could be achieved, crazes could still be initiated at free surfaces, as is discussed in Chapter 11, and craze matter breaks down from either extrinsic or intrinsic imperfections in craze matter at stress levels of around 40 MPa at 293 K. 

FIGURE 16. Compressive yield strength versus temperature for two MoSi2-Si3N4 alloys. 

The only new raw material in this study was the 3-D woven fabric. In this study, 3-D E-glass woven fabric from Parabeam-Netherlands (thickness of 12.7 mm, aerial density of 1.6kg/m, and compressive yield strength of 3.7 MPa) was used. The schematic fabric architecture and detailed fiber woven after impact damage are shown in Figure 6.54. 

A uni-directional aramid fibre composite with a similar volume of fibres will have a tensile strength of about 1400 N/mm However, its compressive yield strength is about one-skth of this at 230 N/mml This also affects the flexural performance, giving a value of about 300 N/mml... 

Table 10.2 Compressive Yield Strength of Solvay KetaSpire PEEK at Several Temperatures [1]...

Table 10.10 Compressive Yield Strength of AvaSpire PAEK at Various Temperatures [4]...

Gladkikh (1975) has reported the compression and tensile properties of lutetium as a function of temperature, fig. 8.43. The metal was claimed to be 98.7% pure but no analysis was given and the condition of the metal is unknown. The compression strength exhibits a peak at 580 K and a minimum appears, at the same temperature, in the maximum compression strain. Insufficient data are available to determine whether a similar behavior is manifest in the tensile properties. Both elongation and reduction in area are low, less than 10%, and the ultimate tensile strength is less than the compression yield strength. This discrepancy suggests the metal was relatively brittle, especially below about 600 K. 

The effect of the boundary thickness is small, except in the low nano range, below 100 nm. It should also be noted that both the compressive stress and the compressive yield stress decrease in the very low nano range, indicating an inverse H-P relation. Porosity reduces the compressive yield strength, but the shape of the cmwes is not affected. 

Both the Young s modulus data and the 0.2% offset compressive yield strengths are plotted in Figure 22.17, as a function of the strain rate. The yield strength increases with the strain rate. The relationship between yield strength and strain rate is fitted into the model given by Chen and Zhou [76],... 

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