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 is the basis for classifying fabrics used in aircraft covering because the primary requirement for these fabrics is their resistance to being pulled apart under load.

Relevant knowledge points:
- Tensile strength: the maximum axial (pulling) load a material can carry before rupture, usually expressed as force per unit width for fabrics (e.g., pounds per inch).
- Bearing strength: capacity of a material to resist compressive load around a fastener or contact point.
- Shear strength: resistance to forces that cause internal sliding between material planes.
For aircraft covering, the fabric must resist tension from aerodynamic loads and surface tightening, so tensile properties are what determine category and allowable applications.

Step-by-step reasoning:
1. Identify loading mode on aircraft fabric: the covering is stretched and loaded in tension by rigging, dopeshrinkage, and aerodynamic forces — axial tensile stresses predominate.
2. Determine what property quantifies that resistance: the tensile test measures maximum load before failure. For fabrics, results are normalized as force per unit width (e.g., lb/in) to compare different materials.
3. Classification uses those tensile values: fabrics are grouped by tensile strength ranges to ensure minimum performance for a given installation.

Example calculation (illustrative):
- A fabric specimen 2.0 in wide breaks at a load of 450 lb in a tensile test.
- Tensile strength per inch = breaking load ÷ specimen width = 450 lb ÷ 2.0 in = 225 lb/in.
This numeric value is directly used to compare and classify fabrics.

Why the other options are incorrect:
- Bearing strength is concerned with localized compressive deformation around fasteners, not the overall load-bearing capacity of a stretched covering.
- Shear strength addresses sliding failure between planes, which is not the controlling failure mode for a stretched fabric skin.

Conclusion: Because aircraft covering performance is governed by resistance to axial pulling loads, the strength classification is based on tensile strength, confirming the correct answer: Tensile strength.

the strength classification of fabrics used in aircraft covering is based on: tensile strength bearing strength. shear strengthSingle choice

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