"modulus" is correct and usable in written English.
It is a mathematical term defined as the "absolute value of a number" or the "remainder left after division". You can use it when referring to mathematical concepts such as in the following example: The modulus of 7 is 7 since it is an absolute value which cannot be negative.
The proposal relies on two properties of the material used to make the shield its density and its "bulk modulus", a measure of its springiness.
A value for bending stress can then be obtained by dividing the maximum bending moment by a beam section modulus of the hull structure, which is calculated from a detailed structural plan.
More suitable for non-aerospace applications are glass fibres (whose modulus can approach 1.5 times that of aluminum) or, in somewhat special cases, a mixture of glass and carbon fibres.
Two primary properties of any metal are (1) its yield strength, defined as its ability to resist permanent deformation (such as a fender dent), and (2) its elastic modulus, defined as its ability to resist elastic or springy deflection like a drum head.
(3) Bulk modulus (k) is the ratio of the confining pressure to the fractional reduction of volume in response to the applied hydrostatic pressure.
The most commonly specified mechanical properties of polymers include stiffness and breaking stress, quantified in the table of properties and applications as flexural modulus and tensile strength.
The value of the bulk modulus for steel is about 2.3 × 107 psi, or 1.6 × 1011 pascals, three times the value for glass.
Since the largest hard numbers that can currently be factored are only half this size, and since the difficulty of factoring roughly doubles for each additional three digits in the modulus, 310-digit moduli are believed to be safe from factoring for several decades.
Another method does not use fibres at all; instead the reinforcement is in the form of small, high-modulus particles.
For example, although fibres made from polypropylene can be very strong, their tensile strength is only about one-fourth that of the high-modulus polyethylene fibres.
The answer lies in efforts made over the years by materials scientists, polymer chemists, mechanical engineers, and production managers to combine relatively weak and low-stiffness resins with high-strength, high-modulus reinforcements, thereby making new materials called composites with much more suitable properties than plastics alone.
