from 1.1 to 1.125 of the vehicle's maximum 

 operating depth). Because the submersible 

 will be subjected to cyclic pressures, a model 

 of it may be subject to cyclic testing where 

 the external pressure in the test chamber 

 usually is held constant, and the pressure is 

 varied within the vehicle's hull. This avoids 

 cycling the test chamber. In submersibles 



too large for test chambers strain gages are 

 utilized and read by the occupants during 

 dives. In some cases a few gages may be left 

 on at critical positions and monitored period- 

 ically during the vehicle's operations. An 

 example of a strain gage reading and its 

 location is provided in Figure 5.23 from 

 DSRV-2 tests (37). 



STRAIN GAGE LOCATIONS 



237 235 



2600 



^ EQUIV. 

 5,000-FT. 

 DEPTH IN 

 SEAWATER 



600 

 400 

 200 







200 400 600 800 1000 1200 1400 1600 



STRAIN /ulN. /IN. ( + ) 

 Fig. 5.23 Strain gage readings and location on viewport of DSRV-2. 



273 



