The phrase "adequate stiffness" is correct and usable in written English.
It can be used in contexts where you are discussing the necessary level of rigidity or firmness required for a material or structure to function properly.
Example: "The engineers determined that the bridge required adequate stiffness to support the weight of heavy vehicles."
Alternatives: "sufficient rigidity" or "appropriate firmness."
Requiring PhPs to exhibit an adequate stiffness is, therefore, an important design consideration.
Bracing that is used to reduce the effective length of compressive members, and thereby increase their load carrying capacity, must be designed to provide adequate stiffness and strength.
The osteoporotic trabeculae were more oriented in the longitudinal direction, compensating for effects of bone loss and ensuring adequate stiffness for normal daily loading.
Results of Benkelman beam test showed that the foamed asphalt treated recycled ash mix layer cured and gained adequate stiffness within a period of 24 h.
It is demonstrated that due to their unsuitable proportions, available standard GFRP sections do not have adequate stiffness and buckling strength.
Ideally, the dynamic plate design should maintain adequate stiffness of the construct while providing a reasonable load sharing with the strut graft.
The main consideration in chassis design is to have adequate bending stiffness for better handling characteristics.
It is of critical importance that MR-FREIs maintain adequate vertical stiffness to satisfy the requirements for an isolation system.
To retain adequate strength, stiffness, and fatigue performance of the delaminated composite structures, thick laminates or improved interlaminar properties are often employed.
The concept of solid mechanics provides the analytical methods of for designing solid engineering systems with adequate strength, stiffness, stability, and integrity.
In order to design aerodynamically stable suspension bridges with low torsional natural frequencies it is suggested to increase the mass moment of inertia and provide adequate torsional stiffness by the main cables spacing.
