The strength classification of fabrics used in aircraft covering is based on:

tensile strength.
bearing strength.
shear strength.

Question

The strength classification of fabrics used in aircraft covering is based on:

tensile strength.
bearing strength.
shear strength.

BlackTom AI · Accepted Answer

Tensile strength measures the maximum pulling force a fabric can withstand per unit width before failure, so it directly quantifies the ability of aircraft covering to resist the stretching and aerodynamic loads experienced in service.

1. Relevant knowledge points and concepts
- Tensile strength: breaking load per unit width (e.g., pounds per inch or N/mm) in warp and fill directions; critical for fabric coverings subjected to tension from rigging, aerodynamic pressures, and shrinkage treatments.
- Bearing strength: capacity of a material around a fastener hole to carry compressive loads from a bolt or rivet; more relevant to stiff sheet materials and joint interfaces.
- Shear strength: resistance to sliding failure along a plane inside a material; applies primarily to homogeneous or laminated structural members.

2. Complete reasoning process step by step
- Aircraft fabric coverings are flexible membranes attached to the airframe and must carry tensile loads produced by aerodynamic pressure, control-surface deflection, and fabric-tightening procedures.
- Classification must reflect the fabric’s behavior under those loads; therefore a direct measure of ultimate tensile capacity is the appropriate metric.
- Standards/test methods for aircraft fabrics call for tensile testing in both warp and fill directions to determine breaking strength per unit width; that value is used to grade or classify fabrics.

3. Example calculation and intermediate steps
- Tensile strength (TS) = breaking load (L) / specimen width (w).
- If a specimen 1.0 in wide breaks at L = 120 lbf, then TS = 120 lbf / 1.0 in = 120 lbf/in. This is the figure used in classification tables.

4. Why the correct answer is correct
- Because the dominant service demands on covering are tensile in nature, classification by tensile strength ensures fabric meets minimum load-carrying requirements and provides consistent, comparable ratings.

5. Why the other options are incorrect
- Bearing strength is about how surrounding material resists compressive stress from fasteners; it is not the primary behavior of a stretched fabric.
- Shear strength describes internal sliding failure, which is not the principal failure mode for thin, woven coverings under flight loads.

6. Conclusion
- Therefore, the strength classification of fabrics used in aircraft covering is based on tensile strength. Final answer: a. tensile strength.

The strength classification of fabrics used in aircraft covering is based on: tensile strength. bearing strength. shear strength.单项选择题

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