Wyniki wyszukiwania - BazTech

1

Influence of notch (TIP) radius on fatigue crack growth rate

Rozumek D., Macha A., Lazzarin P., Meneghetti G.

Journal of Theoretical and Applied Mechanics

|

2006

|

Vol. 44 nr 1

127-137

EN

The paper deals with the problem of fatigue crack propagation from notches in plates made of FeP04 steel and AA356-T6 aluminium alloy. The tests were performed under different stress ranges by keeping the nominal load ratio (R=0.1) constant. The specimens were weakened by nearly sharp and blunt two sided notches. The results of the fatigue tests were then reanalysed in terms of the J-integral range including influence of the notch. It was observed that the blunter notches are, the higher fatigue crack growth rate is.

PL

W pracy przedstawiono propagację pęknięć zmęczeniowych, w próbkach płaskich z karbami, wykonanych ze stali FeP04 i stopu aluminium AA356- T6. Badania wykonywano przy różnych zakresach naprężeń i stałym współczynniku asymetrii cyklu (R = 0.1). Próbki były osłabione przez dwustronne ostre i łagodne karby. Wyniki badail zmęczeniowych opisano za pomocą zakresu całki J z uwzględnieniem wpływu karbu. Stwierdzono, że im łagodniejszy karb, tym większa prędkość wzrostu pęknięć zmęczeniowych.

2

J-integral range to characterize fatigue crack growth rate in notched specimens

Rozumek D., Lazzarin P., Macha E., Meneghetti G.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

|

2005

|

z. 82

179-186

EN

The paper deals with fatigue crack propagation from notches in plates made of FeP04 steel and AA 356-T6 aluminium alloy. The tests were performed under different stress ranges by keeping constant the nominal load ratio (R=0.1). The specimens were weakened by nearly-sharp and blunt two-sided notches. The results of the fatigue tests are reanalysed here in terms of J-integral range including the notch influence. It was observed that the blunter notches are, the higher fatigue crack growth rate is.

3

Fracture Mechanics and Notch Sensitivity

Atzori B., Lazzarin P., Meneghetti G.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

|

2005

|

z. 79

9-31

4

Fatigue strength of welded joints: a synthesis based on generalised stress intensity factors and local strain energy

Lazzarin P., Livieri P., Mutignani F.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

|

2005

|

z. 82

139-146

EN

In this contribution the weld toe region is modelled as a sharp V-notch and the intensity of asymptotic stress distributions are quantified by means of generalised stress intensity factors. When the V-notch opening angle is constant, mode I NSIF is used to summarise the fatigue strength of welded joints. Otherwise, the synthesis is carried out on the basis of the mean value of the strain energy density over a well-definite volume surrounding the weld toe or the weld root.