Low strain properties

Moving straight north from point A , we eventually increase the styrene content sufficiently that the polymer begins to behave with polystyrene continuous phase tendencies. The low strain properties (tensile, flexural modulus) are more plastic-like than rubber-like. 

Field tests which are most commonly employed in geotechnical earthquake engineering can be grouped into those that measure low-strain properties and those that measure properties at intermediate to high strains. Low-strain field tests t5q)ically induce seismic waves in the soil and seek to measure the velocities at which these waves propagate. Due to low strain amplitudes the measured shear wave velocity (V ) along with soil density (p) is used to compute low-strain shear modulus. 

However, despite some improvements in low strain properties such as elastic modulus, these blends often suffer from poor interfacial... 

The measurement of soil dynamic properties is a crucial task in the solution of any geotechnical earthquake engineering problem. Particularly for the evaluation of local site effects, the characterization of the soil deposit above bedrock in terms of variation of Go and D with depth and G/Go yc and D — y curves is essential. A variety of field and laboratory techniques are available, each oriented toward the measurement of low-strain properties and characterized by different advantages and limitations. A complete review of the existing techniques is outside the scope of this entry, and only the most significant ones are discussed in the following. 

The mechanical propterties of polyethylene may be divided into two broad categories (1) low strain properties sueh as yield stress and initial modulus and (2) high strain properties, typified by ultimate tensile strength and draw ratio at break. To a first approximation, the low strain properties are controlled by a sample s morphological features, and the high strain properties by its molecular characteristics. 

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