Comparison of Experimental and Simplified Analytical Results for the In-Plane Plastic Bending and Buckling of an Elbow

1980 ◽  
Vol 102 (4) ◽  
pp. 400-409 ◽  
Author(s):  
L. H. Sobel ◽  
S. Z. Newman
Keyword(s):  
Strain Curve ◽  
Experimental Results ◽  
304 Stainless Steel ◽  
Stress Strain Curve ◽  
Element Analysis ◽  
Pipe Bend ◽  
Plane Plastic ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Good Agreement

Predictions obtained from a simplified finite element analysis are compared with experimental results on the plastic in-plane bending and buckling of a 16-in-dia Type 304 stainless steel piping structure which consists of a 90-deg elbow and two straight tangent pipes. The large displacement analysis is based on the widely used MARC pipe-bend element 17, and on a stress-strain curve obtained from coupon specimens taken from the tested elbow. The simplified analysis predictions are found to be in reasonably good agreement with the experimental results. The analysis underestimates the experimental buckling load by 10 percent and overestimates the deformation at a given load, particularly at the higher load levels.

scholarly journals Effects of layer shift and yarn path variability on mechanical properties of a twill weave composite

2016 ◽  
Vol 51 (7) ◽  
pp. 913-925 ◽  
Author(s):  
MY Matveev ◽  
AC Long ◽  
LP Brown ◽  
IA Jones
Keyword(s):  
Numerical Analysis ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Element Analysis ◽  
Damage Propagation ◽  
Macro Scale ◽  
Twill Weave ◽  
Modulus Reduction ◽  
Good Agreement

Experimental and numerical analyses of a woven composite were performed in order to assess the effect of yarn path and layer shift variability on properties of the composite. Analysis of the geometry of a 12 K carbon fibre 2 × 2 twill weave at the meso- and macro-scales showed the prevalence of the yarn path variations at the macro-scale over the meso-scale variations. Numerical analysis of yarn path variability showed that it is responsible for a Young’s modulus reduction of 0.5% and CoV of 1% which makes this type of variability in the selected reinforcement almost insignificant for an elastic analysis. Finite element analysis of damage propagation in laminates with layer shift showed good agreement with the experiments. Both numerical analysis and experiments showed that layer shift has a strong effect on the shape of the stress–strain curve. In particular, laminates with no layer shift tend to exhibit a kink in the stress–strain curve which was attributed solely to the layer configuration.

Visualization of Thermal Fatigue Damage Distribution With Simplified Stress Range Calculations

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Junya Miura ◽  
Terutaka Fujioka ◽  
Yasuhiro Shindo
Keyword(s):  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Elastic Stress ◽  
Computation Time ◽  
304 Stainless Steel ◽  
Engineering Systems ◽  
Damage Distribution ◽  
Element Analysis ◽  
Type 304 ◽  
Type 304 Stainless Steel

This paper proposes simplified methods to evaluate fatigue damage in a component subjected to cyclic thermal loads to visualize damage distribution by using typical computer-aided engineering systems. The objective is to perform the evaluations on a standard desktop PC within a reasonably short computation time. Three simplified methods for defining elastic stress ranges are proposed in place of the method in the ASME Subsection NH procedures. A thermal fatigue test that was previously performed using a type-304 stainless steel (304SS) cylinder is simulated to validate the proposed methods. Heat transfer and elastic analyses are conducted. Simultaneously with the analyses, fatigue usage factors are calculated using user subroutines formulated in this study, including the three simplified methods and the ASME NH-based method. The calculated values of the fatigue usage factor are visualized using a graphical user interface (GUI) incorporated into a commercial finite-element analysis (FEA) code. The fatigue usage factor distribution obtained using the simplified methods could be calculated without requiring large amounts of memory and long computation time. In addition, the distribution of the fatigue usage factor was consistent with the distribution of cracks observed in the test.

Study on Stamping Process of 304 Stainless Steel Bipolar Plate

2021 ◽  
Vol 901 ◽  
pp. 170-175
Author(s):  
Tung Sheng Yang ◽  
Ting Fu Zhang ◽  
Tung Wei Lin ◽  
Can Xun Zhang
Keyword(s):  
Stainless Steel ◽  
Proton Exchange Membrane ◽  
Strain Curve ◽  
Bipolar Plate ◽  
Proton Exchange ◽  
304 Stainless Steel ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Element Analysis ◽  
Stamping Process

Bipolar plate is the key component of proton exchange membrane fuel cells. Due to the factors of rapid and mass production, the stamping process is selected to manufacture the bipolar metal plates. First, the stress-strain curve is performed by universal material testing machine.The stress-strain curve is necessary for bipolar plate stamping simultion. The maximum forging load and effective stress distribution of bipolar plate stamping are determined by finite element analysis. Finally, the effect of the traditional crank stamping on the flatness and section thickness of stainless steel bipolar plate are observed by experiments.

Multilevel Strain Controlled Fatigue on a Type 304 Stainless Steel

1983 ◽  
Vol 105 (3) ◽  
pp. 188-194 ◽  
Author(s):  
M. Bernard-Connolly ◽  
T. Bui-Quoc ◽  
A. Biron
Keyword(s):  
Stainless Steel ◽  
Interaction Effect ◽  
Fatigue Tests ◽  
Cumulative Damage ◽  
Experimental Results ◽  
304 Stainless Steel ◽  
Damage Effect ◽  
Strain Pattern ◽  
Type 304 ◽  
Type 304 Stainless Steel

A series of cumulative damage strain-controlled fatigue tests at 20°C has been carried out on a Type 304 stainless steel with two, three, and five strain levels, both in an increasing and decreasing order. Experimental results show that if the strains are applied in an increasing order, the summation of cycle ratios is greater than unity, whatever the number of applied levels. For a decreasing order, this summation is less than one. However, for the same difference between high and low levels, this summation is closer to unity when the number of applied levels increases. The cumulative damage effect is evaluated using an approach which takes into account the sequence effect of loading. The procedure is based on the modification of the damage evolution with respect to that corresponding to constant amplitude loading. This is explained by an interaction effect due to a previous loading. With the interaction effect parameter suggested, the procedure is generalized to any discrete strain pattern. An application of the method is carried out to estimate the sums of life fractions required for failure for the material investigated. The correlation between predictions and experimental results is then discussed.

Elevated Temperature Elastic-Plastic-Creep Test of an Elbow Subjected to In-Plane Moment Loading

1977 ◽  
Vol 99 (2) ◽  
pp. 291-297 ◽  
Author(s):  
A. Imazu ◽  
R. Miura ◽  
K. Nakumura ◽  
T. Nagata ◽  
K. Okabayashi
Keyword(s):  
Creep Behavior ◽  
304 Stainless Steel ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Curved Pipes ◽  
Theoretical Predictions ◽  
Stationary Creep ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Plastic Creep

This paper describes the results of test on elastic-plastic-creep behavior of a 12-in. Sch. 20 type 304 stainless steel elbow-pipe assembly subjected to in-plane moment loading at 600°C (1112°F). During the test, loads at seven different levels were applied to the specimen. In each stage of the test, the load, deflection, strains at specific locations, and ovalization of the cross section were measured. The results were compared with Spence’s theoretical predictions on the stationary creep behavior of smooth curved pipes and the inelastic solutions obtained by the MARC finite element analysis program.

OUTOKUMPU TYPE 630

Alloy Digest ◽  
2016 ◽  
Vol 65 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
High Performance ◽  
High Strength ◽  
Heat Treating ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel

Abstract Outokumpu Type 630 is a martensitic age hardenable alloy of composition 17Cr-4Ni. The alloy has high strength and corrosion resistance similar to that of Type 304 stainless steel. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1238. Producer or source: Outokumpu High Performance Stainless.

Passivity of Type 304 Stainless Steel–Effect of Plastic Deformation

CORROSION ◽  
1972 ◽  
Vol 28 (7) ◽  
pp. 269-273 ◽  
Author(s):  
K. Elayaperumal ◽  
P. K. De ◽  
J. Balachandra
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel
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