книги / Экспериментальные исследования усталостного поведения материалов при многоосных циклических воздействиях
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Таб лица 4.7 Параметр ы модели и значения отклонений
Номер набора данных |
1 |
2 |
|
3 |
|
|
4 |
||
Авторы |
A.Fatemi |
Y. W ang |
T. Xia |
|
|
X. Wang |
|||
[16;44] |
[59] |
[60–63] |
|
|
[58] |
||||
|
|
|
|
||||||
|
|
|
|
|
|
|
|
|
|
τ′ |
, МПа |
434,6 |
559 |
,0 |
|
591,9 |
|||
|
, МПаτ |
–0,082 |
–0,1 |
04 |
|
–0 |
,118 |
||
σ′ |
1093,7 |
886 |
,9 |
|
11 |
98,1 |
|||
τ , МПаσ |
–0,133 |
–0,1 |
02 |
|
–0 |
,145 |
|||
283,0 |
290 |
,0 |
|
|
283,0 |
||||
σ |
, МПа |
450,0 |
545 |
,0 |
|
|
450,0 |
||
τ′ |
|
, МПа |
540,7 |
529 |
,1 |
|
|
613,1 |
|
|
|
|
–0,140 |
–0,1 |
42 |
|
–0 |
,171 |
|
|
|
0,240 |
0,210 |
0,117 |
|
|
0,162 |
||
|
|
|
|
|
|
|
|
|
|
|
0,218 |
0,150 |
0,110 |
|
|
0,157 |
|||
|
|
|
|||||||
а |
б |
в |
г |
Рис. 4.10. Сравн ение экспериментальной и предсказанной долговечности без учета (а, в, д, ж) и при учете (б, г, е, з) угла сдвига фаз для наборов данных 1 (а, б), 2 (в, г), 3 (д, е) и 4 (ж, з)
101
д |
е |
ж |
з |
Рис. 4.10. Окончание
102
ЗАКЛЮЧЕНИЕ
В монографии приведены новые результаты экспериментальных исследований характеристик сопротивления мало- и многоцикловой усталости конструкционных сталей и сплавов при двухосном циклическом нагружении. Показана зависимость циклической долговечности рассматриваемых материалов от комплекса сложных условий термомеханического нагружения, включающего в том числе температуру, вид напряженного состояния, характер двухосного нагружения и переменные параметры цикла. Использован оригинальный подход для классификации режимов многоосной усталости, в рамках которой общий случай многоосного циклического нагружения описывается двадцатью девятью независимыми параметрами. Для прогнозирования циклической долговечности в области мало- и многоцикловой двухосной усталости при растяжении – сжатии и кручении авторами предложена модификация известной модели Сайнса и показаны возможности прогнозирования ресурса конструкционных сталей и сплавов с использованием этой модели для разных режимов двухосного циклического нагружения.
103
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