Temperature Tensile Properties

Thermal Gradients may be measured or calculated by means of heat flow formulas, etc. After they are established it is likely to be found from the formula that for most cyclic heating conditions the tolerable temperature gradient is exceeded. This means that some plastic flow will result (for a ductile alloy) or that fracture will occur. Fortunately, most engineering alloys have some ductility. However, if the cycles are repeated and flow occurs on each cycle, the ductility can become exhausted and cracking will then result. At this point it should be recognized that conventional room temperature tensile properties may have little or no relation to the properties that control behavior at the higher temperatures. 

The moisture uptake in the cured samples appears to have no effect on the room temperature tensile properties as demonstrated in Table I. A critical study to be done is to determine the moisture effect on properties at elevated temperatures. 

D. A. Jablonski and R. B. Bhatt, High-temperature Tensile Properties of Fiber-Reinforced Reaction Bonded Silicon Nitride, J. Comp. Tech. Res., 12[3], 139-146 (1990). 

Kurata, Y., Tachibana, K., and Suzuki, T., High temperature tensile properties of metallic materials exposed to a sulfuric acid decomposition gas environment, Journal of Japan Institute of Metals, 65, 262-265, 2001. 

The room-temperature tensile properties for the present epoxy networks are independent of or the distribution of M. This independence is ascribed to the restricted motion of the main chains, even above Tg, as deduced from the creep experiments. 

Table 4. Room temperature tensile properties of the SSA000 alloy after casting and heat treatment.

Figure 5 Room temperature tensile properties of extruded rods of developmental alloys SSA000 and SSA018 and a commercial alloy 7075 in T6 temper.

Figure 8 Room temperature tensile properties of forgings of the developmental alloy SSA018 in the radial and transverse directions and of a commercial alloy 7075-T6 in radial direction.

The effect of zinc stearate concentration on the room temperature tensile properties of the zinc, barium, and magnesium ionomers is illustrated in Figure 5. Whereas stearic acid showed little or modest improve-... 

Fig. 2.1 Elevated-temperature tensile properties for select nickel- and cobalt-base alloys. Source Ref 35, 37...

The composition and minimum room-temperature tensile properties of Ti-6A1-4V alloys are summarized in Tables 7.1 to 7.3 (Ref 1). The alloy is most commonly produced in the mill-annealed condition, where it displays a useful combination of strength, toughness, ductility, and fatigue properties. It is also found in the... 

Beta 21-S. The Beta 21-S alloy is a relatively new metastable beta alloy (Ref 1). It was designed to have good formability, similar to Ti-15-3, but also has improved oxidation resistance, creep resistance, and high-temperature strength relative to Ti-15-3. Composition ranges and room-temperature tensile properties for Beta 21-S are listed in Tables 7.1 to 7.3. The alloy contains approximately 15% Mo, 3% Al, and 2.8% Nb, with additions of silicon (Ref 1). It is normally provided in the beta solution-treated condition. Beta 21-S has an elastic modulus close to that of bone and hnds use in prosthetic application. It has excellent high-temperature stability and can be used at temperatures up to 290 °C (550 °F). 

FIGURE 10. Influence of 100 hr erqjosure in nitrogen and oxygen environments on room temperature tensile properties of 1-D SiC/RBSN composites containing -24 vol% fibers [21], Normalized strength is defined as the ratio of room temperature tensile strength of the environmentally exposed specimens to that of the as-fabricated... 

TABLE VI. Room temperature tensile property data for Hi-Nicalon SiC/RBSN composites [11]. 

J. Z. Gyekenyesi and N. P. Bansal, High Temperature Tensile Properties of Unidirectional Hi-Nicalon/Celsian Composites in Air, NASA/TM-2000-210214, July 2000. 

The effects of oxidation on the ambient temperature tensile properties of the composites are shown in Figures 6, 7, and 8. The effects of600°C oxidation on tensile properties out to 1000 hours are gradual and not very dramatic. Figure 6 shows the effect of600°C oxidation... 

The as-fabricated room temperature tensile properties ofthe composites are summarized in Table 5. It is important to recognize that, due to their high porosity, the matrices in all of these systems have elastic moduli and strengths an order of magnitude less than those of the fibers [145], hence the composites are highly orthotropic in most manifestations, e.g. laminates [143, 146], See [147] for an extensive review ofthe mechanics of brittle matrix composites. The properties in Table 5 represent the response to loading in the fiber direction. The fiber direction orientation, denoted as 0°/90°, is the most favorable orientation the strength and stiffness in any other orientation, denoted as off-axis , is substantially lower. 

At relatively low doses, < 300 kGy, there is virtually no change in the room temperature tensile properties of PVDF when irradiated with an electron beam. For higher doses, > 300 kGy, there is an increase in the Young s modulus and a decrease in both tensile strength and elongation at break [124]. A recent study of the dependence of irradiation dose on the physical, chemical, and thermal properties of PVDF has been carried out [133]. 

Figure 11. Variations of the room temperature tensile properties of SiC-based fibers as a function of the temperature. The pyrolysis temperature for Si-C-0 fibers deriv from PCS and Si-C fibers derived from radiation-cured PCS with 0.4 wt.% of oxygen [77] reproduced with permission from the Woodhead Publishing Ltd.

Best values of room temperature tensile properties. 

Table 3.3 Effect of Test Environment on Room-Temperature Tensile Properties of...

Specific gravity, density Maximum continuous-use temperature Tensile properties of thin plastic sheeting Determining the bearing strength (bearing stress to cause 4% strain)... 

Ti-3Ai-2.5V Typical room-temperature tensile properties for solution treated plus aged specimens... 

Effect of cold work on the room-temperature tensile properties of T-3AI-2.5V sheet. 

Effect of 2 h annealing (or stress relieving) temperature on room-temperature tensile properties of full hard (50% odd worked) tubing. With a room-temperature full hand strength of 999 MPa (145 ksl) UTS and 896 MPa (130 ksl) tensile yield strength. 15.8 mm (0.625 in.) OD X 0.96 mm (0.038 in.) wall 50% CW+anneal, 2 h in vacuum, vacuum cool to approximate 425 °C (800 °F), AC. 

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