Question

As compared to woven fabrics, the values of G, HB & 2 HG in knit goods are

• A. Moderately high
• B. Very high
• C. Lower
• D. Moderately low

Hint:

• Knitted fabrics} (due to their interlooped structure) are generally:
  • More extensible (stretchy)
  • More flexible (lower bending rigidity B)
  • Easier to shear (lower shear stiffness G)
  • Softer and better draping
  compared to woven fabrics} (interlaced structure), assuming similar fiber type and weight.
• Therefore, parameters like G (shear stiffness) and B (bending rigidity, often denoted HB in some contexts of KES-F or if 'HB' refers to hysteresis) are typically lower} for knitted goods than for woven fabrics.
• Hysteresis values (2HG, 2HB) reflect recovery and energy loss; these also differ but the prime distinction in stiffness parameters (G, B) is "lower".

Answer 1

The Correct Option is C

In textile engineering, several parameters like G (shear modulus), HB (bending rigidity), and 2HG (hysteresis of bending) are often compared between different types of fabrics. When comparing knitted fabrics to woven fabrics, these values typically differ due to the structure and mechanics of the materials.

1. G (Shear Modulus): Knitted fabrics generally have a lower shear modulus compared to woven fabrics. This is because knitted fabrics are more flexible and have more stretchability due to their looped structure.

2. HB (Bending Rigidity): The bending rigidity of knitted fabrics is also lower. The interlooping pattern allows them to bend more easily as compared to woven fabrics which are structured with tightly interlaced yarns.

3. 2HG (Hysteresis of Bending): This value indicates the resistance to deformation. In knitted fabrics, the 2HG value is lower, which means they return to their original shape more easily after being bent.

Therefore, considering the structural characteristics and mechanical properties of knitted fabrics versus woven fabrics, the values of G, HB, and 2HG in knit goods are indeed lower.

The correct answer is: Lower