ISO 14623:2003 pdf download

ISO 14623:2003 pdf download.Space systems -Pressure vessels and pressurized structures -Design and operation.
NOTE For a surface crack, the flaw shape is expressed as a/2c, where a is the crack depth and 2c is the crack length. For a corner crack, the flaw shape is expressed as a/c, where a is the crack depth and c is the crack length
2.27
fracture control
application of design philosophy, analysis method, manufacturing technology, verification methodology, quality assurance, and operating procedures to prevent premature structural failure caused by the propagation of cracks or crack-like flaws during fabrication, testing, transportation, handling and service
2.28
fracture mechanics
engineering discipline that describes the behaviour of cracks or crack-like flaws in materials or structures under stress
2.29
fracture toughness
generic term for measures of resistance to the extension of a crack
2.30
hazard
existing or potential condition that can result in an accident
2.31
hydrogen embrittlement
mechanical-environmental process that results from the initial presence or absorption of excessive amounts of hydrogen in metals, usually in combination with residual or applied tensile stresses
2.32
impact damage
induced fault in the composite overwrap or the metallic liner of a composite overwrapped pressure vessel that is caused by an object strike on the vessel or vessel strike on an object
2.33
impact damage protector
physical device that can be used to prevent impact damage
2.34
initial flaw
flaw in a structural material before the application of load and/or deleterious environment
2.35
leak-before-burst
LBB
design concept which shows that at MEOP potentially critical flaws will grow through the wall of a metallic pressurized hardware item or the metal liner of a composite overwrapped pressure vessel and cause pressure relieving leakage rather than burst or rupture (catastrophic failure)
2.36
limit load
highest predicted load or combination of loads that a structure can experience during its service life in association with the applicable operating environments
NOTE The corresponding stress is called limit stress.
2.37
loading case
particular condition of pressure/temperature/loads that can occur for some parts of pressurized structures at the same time during their service life
2.46
pressure vessel
container designed primarily for the storage of pressurized fluid that fulfils at least one of the following criteria:
a) contains gas or liquid with high energy level;
b) contains gas or liquid which will create a mishap (accident) if released;
c) contains gas or liquid with high pressure level
NOTE 1 This definition excludes pressurized structures, pressure components and pressurized hardware.
NOTE 2 Energy and pressure level are defined by each project, and approved by the procuring authority (customer); if appropriate values are not defined by the project, the following levels are used:
stored energy is 19 310 J or greater based on adiabatic expansion of perfect gas;
MEOP is 0,69 MPa or greater.
2.47
pressurized hardware
hardware items that contain primarily internal pressure
NOTE In this document, the term covers all pressure vessels and pressurized structures (2.48).
2.48
pressurized structure
structure designed to carry both internal pressure and vehicle structural loads
EXAMPLE Launch vehicle main propellant tanks, crew cabins or manned modules.
2.49
pressurized system
system which consists of pressure vessels, or pressurized structures, or both, and other pressure components such as lines, fittings, valves and bellows, which are exposed to, and structurally designed largely by, the acting pressure
NOTE Electrical or other control devices required for system operations are covered by this term.
2.50
proof factor
multiplying factor applied to the limit load or MEOP (or MDP) to obtain proof load or proof pressure for use in the acceptance testing
2.51
proof pressure
product of MEOP (or MDP) and a proof factor
NOTE The proof pressure is used to provide evidence of satisfactory workmanship and material quality and/or to establish maximum initial flaw sizes for the safe-life demonstration of a metallic hardware item.
2.52
qualification tests
required formal contractual tests used to demonstrate that the design, manufacturing, and assembly have resulted in hardware designs conforming to specification requirements
2.53
residual strength
maximum value of load and/or pressure (stress) that a cracked or damaged body is capable of sustaining.