Compressive property

Compressive properties of fibens also are important. Fibers often experience compressive forces while being made into the final products. The final products also may be under compression when they are in use. Therefore, it is important to imdeistand the compressional properties of fibers. 

---

Density and polymer composition have a large effect on compressive strength and modulus (Fig. 3). The dependence of compressive properties on cell size has been discussed (22). The cell shape or geometry has also been shown important in determining the compressive properties (22,59,60,153,154). In fact, the foam cell stmcture is controlled in some cases to optimize certain physical properties of rigid cellular polymers. 

Mechanical Properties. The performance of various polyester resin compositions can be distinguished by comparing the mechanical properties of thin castings (3 mm) of the neat resin defined in ASTM testing procedures (15). This technique is used widely to characterize subtle changes in flexural, tensile, and compressive properties that are generally overshadowed in highly filled or reinforced laminates. 

Cork rubber 300 Controlled compressibility properties. Good couformability, fatigue resistance. Chemical resistance depends on kind of rubber used. 

Fig. 6-5 Effect of distance between TS cross-linked sites on compression properties.

A compressor may be thought of as a high pressure pump for a compressible fluid. By high pressure is meant conditions under which the compressible properties of the fluid (gas) must be considered, which normally occur when the pressure changes by as much as 30% or more. For low pressures (i.e., smaller pressure changes), a fan or blower may be an appropriate pump ... 

N-Stearoyltyrosine. The case of N-stearoylserine methyl ester illustrates temperature-dependent enantiomeric discrimination in both monolayers spread from solution and in equilibrium with the bulk phase. Although the IIIA isotherms suggested large differences in the intermolecular associations in homochiral and heterochiral films of SSME, there exist chiral systems in which enantiomeric discrimination as exhibited in film compression properties is much more subtle. N-Stearoyltyrosine (STy) is such a system. 

Table 7.1 Compression properties of pure silica and hybrid aerogels con-...

ISO 844 2001 Rigid cellular plastics - Determination of compression properties ISO 3386-1 1986 Polymeric materials, cellular flexible - Determination of stress-strain characteristics in compression - Part 1 Low-density materials ISO 3386-2 1997 Flexible cellular polymeric materials - Determination of stress-strain characteristics in compression - Part 2 High-density materials ISO 5893 2002 Rubber and plastics test equipment - Tensile, flexural and compression types (constant rate of traverse) - Specification ISO 7743 2004 Rubber, vulcanized or thermoplastic - Determination of compression stress-strain properties... 

Generally, the sandwich composites combine light weight, good flexural stiffness and good stress distribution without weak points. Tensile and compression properties, particularly punching, can be weak. 

Good compression properties for cores made of honeycombs, wood and plywood. Low compression properties for foamed cores. The compression strength and modulus of a lOOkg/m foam are roughly as low as 2 MPa and 0.1 GPa, respectively. On the other hand, pinpoint impact is distributed across the whole surface facing, provided it is sufficiently resistant. 

Compression properties are important in determining the ability of the compound to form tablets with or without the presence of excipients. 

TMA measures the mechanical response of a polymer looking at (1) expansion properties including the coefficient of linear expansion, (2) tension properties such as measurement of shrinkage and expansion under tensile stress, i.e., elastic modulus, (3) volumetric expansion, i.e., specific volume, (4) single-fiber properties, and (5) compression properties such as measuring the softening or penetration under load. 

Canet, W., Alvarez, M. D., Fernandez, C. (2005c). Optimization of low-temperature blanching for retention of potato firmness effect of previous storage on compression properties. Eur. Food Res. Techrwl., 221,423 33. 

ASTM (1984) D695-80. Annual Book of A STM Standards, Section 8, Standard Test Method for Compressive Properties of Rigid Plastics, ASTM, pp. 290-297. 

---