Compressive strength of plastics

FIGURE 3.70 Test for compressive strength of plastics. Compressive strength (Ibffin. or kg /cm )=load (Ibf or kgf)/fl b (in. or cm ). Standard test methods ASTM D795, BS 2782 method 303, ISO R604. 

As with most metals and other nonplastics engineering materials, the compressive strength of plastics is about the same as the tensile strength. 

Instron tester Instron testers measure the flexural, tensile, and compressive strength of plastics as well as the stress-strain curves at ambient temperatures. They are commonly found in most materials testing laboratories. Instron testers come in a range of sizes (generally related to the maximum tensile pull that can be exerted) and types. They are manufactured by the Instron Machine Company. 

A general rule is that the compressive strength of plastics is greater than its tensile strength. However, this is not generally true for reinforced TSs. The compression testing of foamed plastics provides the designer with the useful recovery rate (see Fig. 3-19). 

The rules for support spacing when working with plastic pipe are different than those used for metal pipe. Both the tensile and compression strengths of plastic pipe are lower than those of metal pipe. Recommended spacing is illustrated in Table 5.2. 

In general, the compressive strength of a non-reinforced plastic or a mat-based RP laminate is usually greater than its tensile strength. The compressive strength of a unidirectional fiber-reinforced plastic is usually slightly lower than its tensile strength. Room-temperature compressive stress-strain data obtained per ASTM for several plastics are shown in Table 2-5. 

Apparent tensile strength of tubular (pipe) products by the split disk method External loading characteristics of plastic pipe by parallel plate loading Compressive properties of plastics Adhesion of rubbers to metallic substrates (Procedure E1)... 

Fig. 2. Percent Compressive Strength of Concretes with Four Percent Plastic...

Table 4. Compressive Strength of CMUs with Four Plastic Fillers ...

Figure 4,12 Effect of plasticizer content in PVAC latexes on flexural and compressive strengths of PVAC-modified mortars.

Soutis C. Modelhng the open hole compressive strength of composite laminates tested in hot-wet conditions. Plastics Rubber Compos 2009 38(2/3/4) 55—60. 

The compression properties characterize the strength, deformation and stiffness behaviour of plastics under quasi-static uniaxial compression load conditions. Generally, for these tests commercial universal test systems with different load capacity are used. The valid and common used standard for the compression test of plastics is the ISO 604 (2002) Plastics - Determination of compressive properties. The data collected include also values determined according DIN 53454 and DIN 53457 as well as ASTM D 695 (Fig. 4.33). The specimen of preference exhibits dimensions of 50 x 10x4 mm for the determination of modulus of elasticity and 10 x 10x4 mm for the investigation of the other compressive properties (Fig. 4.34). 

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