Selected Mechanical Properties and Bruise Susceptibility of Nectarine Fruit

Figures & data

Figure 1 Pendulum impactor for impact tests of the nectarines.

Figure 2 Idealized bruise symbols to determine bruise volume in nectarine (based on Aktas et al.^[15]; Yurtlu and Erdogan^[29]).

Figure 3 Temporary deformation and permanent deformation recorded for nectarines under compression load (mean compression load was 88.45 N to create height deformation of 10 mm).

Figure 4 Force-deformation curves and bioyield points (B) of nectarines compressed from cheek side (deformation in height) and from stalk side (deformation in diameter). (Color figure available online.)

Figure 5 Deformation energy values at bioyield point for different loading positions.

Figure 1 Changes in absorbed energy, bruise volume, and bruise susceptibility related to impact position and drop height of nectarines.

Table 1 Variance analysis results of impact tests at different drop heights and drop positions

	Sum of squares	df	Mean square	F-ratio	p-value
For different drop heights
Bruise volume
Between groups	846,938.902	2	423,469.451	5.972	.004**
Within groups	4,041,546.435	57	70,904.323
Total	4,888,485.337	59
Bruise susceptibility
Between groups	7.948	2	3.974	0.897	.413
Within groups	252.491	57	4.430
Total	260.439	59
Energy absorbed
Between groups	83,663.627	2	41,831.813	46.601	.000**
Within groups	51,166.687	57	897.661
Total	134,830.314	59
For different drop positions
Bruise volume
Between groups	15,347.020	1	15,347.020	0.183	.671
Within groups	4,873,138.316	58	84,019.626
Total	4,888,485.337	59
Bruise susceptibility
Between groups	23.862	1	23.862	5.850	.019*
Within groups	236.577	58	4.079
Total	260.439	59
Energy absorbed
Between groups	12,033.118	1	12,033.118	5.684	.020*
Within groups	122,797.196	58	2117.193
Total	134,830.314	59
*Significant at 0.05 level; **Significant at 0.01 level.