How to understand the ultimate load in pressure vessel design
Thread Content
The following is an excerpt from JB4732: “The ultimate load is determined using limit analysis methods and represents the maximum load that a structure made of ideally plastic material (without strain hardening) can withstand.” Under this load, the deformation of the structure will increase indefinitely, resulting in a loss of its load-bearing capacity. This state is known as the plastic limit state of the structure, and the load corresponding to this state is called the ultimate load. ”Now, I have a question: the ultimate load is the load at which the structure yields throughout its entire volume; after that, the structure should enter a strengthening phase. So why does it lose its load-bearing capacity? Isn’t a load that loses its bearing capacity a tensile strength load?
The premise is made very clear: \"using an ideal plastic material (without strain hardening)\\", meaning the strengthening stage is not taken into account!
Structures composed of ideally plastic materials (without strain hardening)