The researchers studied the strength of stainless steel by testing its tensile strength. They found that the strength varied between different samples, ranging from 878 to 1006 MPa. By using a mathematical model called the Weibull distribution, they were able to describe how the strength is distributed. They also discovered that the relationship between the survival probability of the steel and the stress applied to it can be predicted using this model. This information can help engineers confidently determine the mechanical properties needed for their designs.