Stowmaster Towbar Engineering Certification




18 December 2013     
Roadmaster Inc. 
(New Tow-ball  Metric version for Australia)

501-EUR Stowmaster Tow Bar
(ATM) 6615 Lbs. (3000 kg = 3 Metric Tons)

In accordance with Australian Design Rule 62/02.
Section 14.2.1

Linear Static Test performed utilizing MSCNastran FEA Analysis Software.


Load 1

Longitudinal Tension and Compression (Linear Static)
1.50 x 9.81 m/s² x 3000 kg = 44140 N
(1.50 x 32.17 ft/s x 205.50 slugs = 9923 Lbs.)

Results

Total Translation / Deformation = 0.00051 m (0.020 in)

Contour Legend / Solid Von Mises  Stress
See view1.bmp
Range / 0 to 399896 kPa (0 to 58000 psi)


Load 2

Transverse Thrust (Linear Static)
0.50 x 9.81 m/s² x 3000 kg = 14715 N
(0.50 x 32.17 ft/s x 205.50 slugs = 3308 Lbs.)

Results

Total Translation / Deformation = 0.00089 m (0.035 in)

Contour Legend / Solid Von Mises Stress
See view2.bmp
Range / 0 to 399896 kPa (0 to 58000 psi)


View 25 View 26 View 27

   			 

Contour Legend Conversions:

psi			     kPa
18033			1.24 x 105
14208			9.79 x 104
10383			7.16 x 104
6558			4.52 x 104
2733			1.88 x 104
        -1091		        -7.52 x 103
        -4916		        -3.39 x 104
        -8741		        -6.02 x 104
        -12566		        -8.66 x 104
        -16391		        -1.13 x 105
        -20216		        -1.39 x 105
        -24040		        -1.65 x 105
        -27865		        -1.92 x 105
        -31690		        -2.18 x 105
        -35515		        -2.44 x 105
        -39340		        -2.71 x 105
        -43165		        -2.97 x 105
Load 1  Results (Con’t.)

Contour Legend / Solid Von Mises Stress
See VIEW 28 / VIEW 29 / VIEW 30
Range / 6.82 x 105 to 2.47 x 101 kPa (98940 to 3.585 psi)

View 28 View 29 View 30

   			 

Contour Legend Conversions:

psi			    kPa
98940			6.82 x 105
92757			6.39 x 105
86573			5.97 x 105
80390			5.54 x 105
74206			5.11 x 105
68023			4.69 x 105
61839			4.26 x 105
55656			3.83 x 105
49472			3.41 x 105
43288			2.98 x 105
37105			2.55 x 105
30921			2.13 x 105
24738			1.70 x 105
18554			1.27 x 105
12371			8.53 x 104
6187			4.26 x 104
3.585			2.47 x 101
Load 2

Transverse Thrust @ 45? (Linear Static)
0.50 x 9.81 m/s? x 2267.57 kg = 11122.43 N
(0.50 x 32.17 ft/s? x 155.42 slugs = 2499.93 Lbs.)

Results

Total Translation / Deformation = 0.0007 m (0.0296 in.)

Contour Legend / Solid Mean Stress
See VIEW 31 / VIEW 32 / VIEW 33
Range / 9.77 x 104 to –7.76 x 104 kPa (14182 to -11255 psi)

View 31 View 32 View 33

   			 

Contour Legend Conversions:

psi			    kPa
14182			 9.77 x 104
12593			 8.68 x 104
11003			 7.58 x 104
9413			 6.49 x 104
7823			 5.39 x 104
6233			 4.29 x 104
4643			 3.20 x 104
3054			 2.10 x 104
1464			 1.00 x 104
        -126.1		         -8.69 x 102
        -1716		         -1.18 x 104
        -3306		         -2.27 x 104
        -4896		         -3.37 x 104
        -6485		         -4.47 x 104
        -8075		         -5.56 x 104
        -9665		         -6.66 x 104
        -11255		         -7.76 x 104
Load 2  Results (Con’t.)

Contour Legend / Solid Von Mises Stress
See VIEW 34 / VIEW 35 / VIEW 36
Range / 2.22 x 105 to 6.43 x 100 kPa (32269 to 0.933 psi)

View 34 View 35 View 36

   			 

Contour Legend Conversions:

psi			    kPa
32269			2.22 x 105
30253			2.08 x 105
28236			1.94 x 105
26219			1.80 x 105
24202			1.66 x 105
22185			1.52 x 105
20169			1.39 x 105
18152			1.25 x 105
16135			1.11 x 105
14118			9.73 x 104
12102			8.34 x 104
10085			6.95 x 104
8068			5.56 x 104
6051			4.17 x 104
4034			2.78 x 104
2018			1.39 x 104
0.933			6.43 x 100




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