DESIGN OF LAMINATES 



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DESIGN EXAMPLE 6-24. UNIFORMLY LOADED SIMPLY SUPPORTED 



CLOTH LAMINATE PANEL 



A 24 in. wide by 48 in. long plate is to sustain a head of salt water of 2-1/2 ft, Fig. 

 6-48. If the plate is a simply supported 10 oz. cloth reinforced polyester laminate, find 

 the thickness required for a factor of safety of 2. 



Fig. 6-48. Uniformly Loaded 

 Plate with Edges Simply Supported 



The water load on the plate is: 



2.5 x 64. U 



p = m 



1.12 psi 



For a factor of safety of 2, the ultimate load 

 the plate must support is: 



P u = 2 x 1.12 = 2.2U psi 



From Table 6-18 

 For a 9/l6 in. thick plate : P u = 2.09 psi 

 For a 5/B in. thick plate : P u = 3.19 psi 



Therefore, the 5/0 in. thick plate is required. 



DESIGN EXAMPLE 6-25. ULTIMATE UNIFORM LOAD FOR SIMPLY SUPPORTED 



WOVEN ROVING LAMINATE PANEL 



A laminate is 10 in. wide by 36 in. long by 3/8 in. thick and is made of woven roving 

 reinforced polyester resin. 



What ultimate uniform load can the plate support if the edges are simply supported simi- 

 lar to Fig. 6-48? 



From Table 6-17 the ultimate uniform load that this plate can support is equal to 11.98 

 psi or 1725 psf. 



