Ratios of hardness numbers in calculations of static and cyclical strength of structural types of steels СООТНОШЕНИЯ ЧИСЕЛ ТВЕРДОСТИ В РАСЧЕТАХ НА СТАТИЧЕСКУЮ И ЦИКЛИЧЕСКУЮ ПРОЧНОСТЬ КОНСТРУКЦИОННЫХ СТАЛЕЙ

Results of calculations of values of static and cyclical strength of steels used in the structural design and based on the method of experimental and analytical coordination of hardness numbers are presented in the article. Strength measurements taken on the basis of the Rockwell method make it possible to research into the strength characteristics of small-size samples of steel in cases of restoration and inspection of the technical condition of the metalwork. Besides, the Rockwell method is universal and faster than the Brinell method.Thus, the availability of hardness values of small-size samples makes it possible to provide a definition of standard indicators of static and cyclical strength. Moreover, development of the definition of structural and power (synergetic) criteria of reliability of metalsusing the equation of relative strength turn into reality. The solution to this equation ofuniform plastic deformations of dmakes it possible to identify S , S , W , W values.р B K P C The initial experimental value of the hardness number may be used to calculate avariety of static and cyclical properties of steel and to identify the standard strength group and the approximate steel type counterpart.
Приведены результаты расчета на статическую и циклическую прочность сталей строительных конструкций по экспериментальным значениям твердости HRB c аналитическим переводом в HB.Исходной зависимостью между числами твердости HRB и HB являетсяНВ = 60 [(НRB/70)3 + 1]. (1)Вычисление по (1) дает удовлетворительное совпадение расчетных HB итабличных HB значений.По методу экспериментально-аналитического согласования HRB-HB можно определить временное сопротивление разрыву.