Flexure load tables

Similarly, Figure 6 summarizes the creep behavior of glass-and mineral-filled polyphenylene sulfide under three sets of conditions 24°C/5,000 psi flexural load, 66°C/5,000 psi, and 1210C/3,000 psi. Table III compares the per cent loss In apparent creep modulus at 1,000 hours and at 10,000 hours for each of these conditions using the apparent creep modulus at one hour as a basis. These data Indicate that the creep resistance of the glass- and mineral-filled polymer Is similar to that of the 40% glass-filled resin. 

This results in lower values for flexural strength determined by using 4-pt load compared to 3-pt load (Table 7.16). On average, the difference is 9 + 3% in favor of center-point load compared to third-point load in terms of flexural strength test values. 

The PPO-PA blends shown a mold shrinkage of 0.001 in./in. The molding pressure in 15 X10 Ibf/in. (103 MPa) and the processing temperature 260°C. The heat-deflection temperature of the molded specimen under flexural load of264 Ibf/in. is typically 190°C and the maximum resistance to continuous heat is 175°C. The coefficient of linear expansion is 10 cm/cm °C. The mechanical properties of the PPO-PA blends are shown in Table 4.29. 

In an attempt to maximize flexural properties, PP/VB composites were fabricated with the reinforcing preform layers selectively placed near the composite surfaces where the greatest tension / compression occurs during flexural loading. During the composite fabrication process, PP sheets of varied thickness were used in order to situate two preform layers just inside both composite surfaces. The tensile and flexural mechanical properties for a -<10 VB wt.% composite with such uneven fabric distribution are provided in Table II along with the properties for its... 

Table 5.76 Chemical resistance of polycarbonate under low outer fiber strain up to 2% after six days of flexural load...

Fatigue tests under tensile and flexural load were carried out for various temperatures listed in Table 6.3 at a stress ratio of R = 0.05. The results obtained were considered as the data for A = 0 to estimate fatigue strength. 

Table I lists some properties of SMC and BMC. These are a function of resin composition, reinforcement, and molding conditions atid may be regarded as typical. This will serve as a frame of reference as to the property levels obtained with SMC and BMC. The differences which exist between SMC and BMC in tensile, flexural, and impact strengths are attributable to more than just the difference in glass loading. Fiber attrition arising from the compounding techniques for BMC as well as the shorter input fiber length account for the lower strengths.

The strength properties more often specified for plastics materials are (1) tensile strength and elongation, (2) flexural strength, (3) Izod and Gardner impact, and (4) heat deflection temperature under load. Our purpose here is not to describe each test in detail but to point out some of the known effects that colorants and other formulation ingredients can have on these properties. Table 22.1 lists the ISO and ASTM test methods for most of the physical properties, and ref. 1 (pp. 7-112) describes each of the methods in detail. Table 22.2 lists typical values of the above cite four properties for selected thermoplastics. 

Table 8.1 Flexural (three-pt loading) properties of BMAS matrix/SiC/BN/Nicalon fiber composites24...

Because of its higher rigidity at warm temperatures, sand Thermopave formulations are not as flexible as asphalt concrete mixes. A typical sand Thermopave mix (6 wt % asphalt 12 wt % sulfur) exhibits a flexural strain at break of 0.004 cm/cm under the same test conditions as indicated in Table IV. Although this is below the strain values for asphalt concrete, lower flexibility in Thermopave can be tolerated as the tensile stresses and strains developed at the underside of the pavement are lower than for an asphalt pavement of equivalent thickness and subjected to the same loading. Performance of test pavements to date, some over six years old, have not indicated flexibility to be a problem as yet. 

The effects of additives on the mechanical properties of the dispersion system are shown in Table II. None of the additives either in the dispersed phase or the matrix significantly improved any of the mechanical properties. The MBS modifier reduced the flexural strength and impact resistance when used as a dispersed phase additive as did the very high molecular weight pMMA in the matrix. The mechanical properties were much less sensitive to this low volume loading of additives than to similar volumes of crosslinkers. 

As shown in Table 13.4, the loading of wollastonite may be very high. Typically, the compressive and flexural strengths of conventional portland cement are 27 and 5 MPa... 

Equation 3.80 has been verified in measurements made on a flexural-wave oscillator operated successively in air at STP (essentially zero loading) and then with various liquids on one side of the plate. Table 3.4.1 lists the liquids and their properties, and compares measured frequencies with those calculated from Equation 3.80. 

Bateman and coworkers report a comparative analysis of six different hydraulically powered compaction simulators manufactured by a variety of vendors (Table 1), In their round-robin study, they found that the compaction simulators were comparable when operated within a moderate compression stress range of 50-2(X)MPa. However, at higher pressures, correction factors needed to be applied because of elastic distortion and differences in loading characteristics of the hydraulic systems (5). These results are not surprising since like rotary tablet presses, compaction simulators are not perfectly rigid. Therefore, compaction simulators should be properly calibrated (including corrections for mechanical flexure and electronic noise) to ensure the collection of quality experimental data. 

Absorbed energy was calculated from the area under the load-deflection curves. Flexural modulus of elasticity was calculated from the load-deflection relation between 0 and the maximum load. Average properties of all composites are shown in Table 6. 

The results for compression and flexural tests of various mixes are given in Table 1. Six or seven specimens were tested for each setup. In the one day compressive test, similar strength values were observed for plain concrete and various FRCs. It appeared that the 28 day compressive strengths of carpet waste FRCs were lower than that of plain concrete. The plain concrete specimens failed in a brittle manner and shattered into pieces. In contrast, all the FRC samples after reaching the peak load could still remain as an integral... 

Third-point load, 20-in. span. TABLE 3.14 Flexural strength and modulus of composite 2X6 deck boards ... 

---