specific modulus


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specific modulus

The modulus of elasticity of a material divided by its density.
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The researchers' new silicon carbide-infused magnesium demonstrated record levels of specific strength -- how much weight a material can withstand before breaking -- and specific modulus -- the material's stiffness-to-weight ratio.
"The researchers' new silicon-carbide-infused magnesium demonstrated record levels of specific strength - how much weight a material can withstand before breaking - and specific modulus - the material's stiffness-to-weight ratio," according to a press release.
Of all the different types of reinforcement available, natural fibers have attracted the attention of scientists because of their high specific strength and high specific modulus (properties per unit weight), low cost, and environmental friendliness.
When wood powder was used as an element, the specific modulus of rupture and modulus of elasticity values were 38.1 kN-m/kg and 4.9 MN-m/kg, respectively.
Although both types of foams displayed a closed-cell isotropic-like cellular structure, the considerably smaller cell sizes of the [CO.sub.2] dissolution foams resulted in higher values of the specific modulus for similar expansion ratios (30% increase).
While beginning his discussion of the future, Rohatgi asked the question, "Why use composites?" The answer he provided was that the specific modulus of CMMCs is greater than gray and ductile iron and titanium the material has a high wear resistance; and the material has low coefficents of expansion and friction.
Experiments were conducted on the effects of a partial hydrolysis on the mass loss, specific modulus, and surface free energy of modified southern hardwoods, and this article reports the changes in holocellulose content of water-saturated yellow-poplar (Liriodendron tulipifera L.), sweetgum (Liquidambar styraciflua L.), and red oak (Quercus spp.) heated at 150[degrees]C for 30 minutes in three solutions: 1 percent sulfuric acid, deionized water, and 1 percent sodium hydroxide.
Properties such as specific modulus, energy-to-break (specific toughness), strain-at-break, and specific strength were measured.
Modulus of elasticity values were corrected to eliminate density variation by calculating the specific modulus of elasticity (SM) for property comparisons.
The specific modulus [E.sub.s], specific compliance, [J.sub.s], and time exponent, n, are constants which must be determined from experiments.
These composites also exhibited higher specific tensile moduli and strengths than glass fiber--reinforced sheet molding compounds' specific modulus and strength lower bounds and those calculated from specification requirements for glass fiber-reinforced sheet molding compounds.

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