Tensile and shear mechanical properties of laver (Porphyra yezoensis Ueda)

Figures & data

Figure 1. Sample for testing tensile and shear mechanical properties experiments.

Table 1. Factors and levels of tensile and shear mechanical properties experiments.

Experiment No.	Fixed Factors and Levers		Independent Factors and Levers		Evaluation Indicators
	Factors	Levels	Factors	Levels
				10 mm/min
	Origin	D		20 mm/min
1	Harvest time	1	Loading rate	30 mm/min
				40 mm/min	Tensile force
				50 mm/min	Tensile energy
	Loading rate	20 mm/min		D	Shear force Shear energy
2	Harvest time	1	Origin	Q
				L
	Origin	L		1
3	Loading rate	20 mm/min	Harvest time	2
				3

Figure 2. Self-made shear clamp in the shear test.

Figure 3. Results of tensile mechanical properties. (a) The load–displacement curve of the tensile test of laver; (b) Macroscopic view of fracture sites of laver samples under tensile test; (c) Effect of loading rate on tensile force; (d) Effect of loading rate on tensile energy; (e) Effect of harvest time on tensile force; (f) Effect of harvest time on tensile energy; (g) Effect of origin on tensile force; (h) Effect of origin on tensile energy. The different uppercase and lowercase letters indicate a significant difference between group (p < 0.05), while same uppercase and lowercase letters indicate no significant difference between group (p > 0.05).

Figure 4. Results of shear mechanical properties. (a) The load–displacement curve of the shear test of laver; (b) Macroscopic view of fracture sites of laver samples under shear test; (c) Effect of loading rate on shear force; (d) Effect of loading rate on shear energy; (e) Effect of harvest time on shear force; (f) Effect of harvest time on shear energy; (g) Effect of origin on shear force; (h) Effect of origin on shear energy. The different uppercase and lowercase letters indicate a significant difference between group (p < 0.05), while same uppercase and lowercase letters indicate no significant difference between group (p > 0.05).

Figure 5. Microscopic views of laver samples. (a) Microscopic view of normal laver cells; (b) Microscopic view of fracture sites of laver samples under tensile test; (c) Microscopic view of fracture sites of laver samples under shear test.