The phrase "a stiff material" is correct and usable in written English.
It can be used to describe a substance that is rigid or firm, often in contexts related to textiles, construction, or manufacturing.
Example: "The designer chose a stiff material for the structure of the dress to give it a more defined shape."
Alternatives: "a rigid substance" or "a firm fabric".
A stiff material resists deformation in response to an applied force.
The cornified part of the epidermis is strengthened by a stiff material, beta keratin, which is present in place of or in addition to pliable alpha keratin.
The original study was performed using Matrigel-coated tissue culture polystyrene (TCPS), a stiff material that also non-specifically adsorbs serum proteins.
The first piece of clothing is made from a stiff material, it is visible from afar, in day or artificial light.
Although lactide is known as a nontoxic and environmentally friendly plasticizer for PLLA, it migrates relatively quickly to the surrounding medium, leaving a stiff material with inferior properties.
This is particularly evident with Dirichlet conditions on a stiff material, where the norm of the boundary displacement (for example) may be much smaller than the updated residual due to stiffness in the material.
Mechanical tests showed that addition of SF promotes an increase in storage modulus, leading to a stiffer material as compared with pure Alg (6 times higher stiffness).
When the crack is within a stiffer material, the stress intensity factor is larger than that in a homogeneous material and it increases when the distance between the crack tip and interface decreases.
Numerical results show that in most cases, if the crack is embedded in a stiffer material, when the crack is close to the interface, the plastic zone size and the crack tip opening displacement will increase.
Curve a represents a stiffer material than curve b.
This implies a stiffer material behavior which is seen in slightly steeper stress-strain curves.
