Tensile, Dynamic Mechanical, and Vibration Behavior of Layering Sequence Design Effect of Glass Intertwined Natural Kenaf Woven Polymeric Laminates

Figures & data

Figure 1. Schematic design view of layering sequence and hand layup process of stacking composites.

Table 1. Description of stacked composites and their weight fractions of fiber & matrix.

Description of stacked composites	Fiber stacking arrangement	Total fiber (Wt. %)	Epoxy (Wt. %)
Base sample BS	Pure kenaf (KKKKKK)	40	60
Stacked composites 1 (S1)	Skin Glass (GKKKKG)	40	60
Stacked composites 2 (S2)	Alternative skin kenaf (KGKKGK)	40	60
Stacked composites 3 (S3)	Twin skin kenaf and glass core (KKGGKK)	40	60
Stacked composites 4 (S4)	Both glass and kenaf skin layers (GGKKKK)	40	60

K-Kenaf fiber, G-Glass fiber; Skin is an outer fiber layer and the core is an inner fiber layer.

Figure 2. (a)The tensile standard sample size, (b) before fractured sample and after fractured sample during tensile load.

Figure 3. (a) Vibration experimental setup (b) half band-width method (3 dB band-width).

Figure 4. (a) Tensile strength (b) Stress-strain curves of layering stacked composites.

Figure 5. Typical fractured SEM images of S1, S2, S3, S4, and BS stacked composites.

Figure 6. storage modulus (b) loss modulus (c) tan delta of kenaf and glass fiber stacked composites.

Figure 7. (a) Natural frequency (b) damping ratio of kenaf and glass fiber stacked composites.

Table 2. Natural frequency and damping ratio of kenaf/glass fiber stacked composites.

Stacked composites	Natural Frequency (Hz)		Damping ratio
	Mode 1	Mode 2	Mode 1	Mode 2
BS	111	85	0.0572	0.0741
S1	149	121	0.0313	0.0573
S2	136	112	0.0398	0.0667
S3	123	106	0.0364	0.0618
S4	132	117	0.0287	0.0464

Figure 8. Typical photocopy natural frequency and corresponding damping ratio of the S1 stacked composite.