Elastic compliance of single-edge-notched tension SE(T) (or SENT) specimens

Tyson, Bill; Ding, Ping; Wang, Xin

doi:10.3221/igf-esis.30.13

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…As can be seen above, the differences are very small. This is in accordance to the observations made by Tyson et al [11] and Wang et al [9]. Table 4 shows a comparison between the final crack measurements; a p,C and a p,S are the final calculated crack lengths according to Cravero's and Shen's equation respectively, a p is the measured crack length according to the nine points average method as proposed by ASTM E 1820 [5].…”

Section: Crack Growthsupporting

confidence: 86%

“…The 8th order polynomial, although more cumbersome, does have a larger interval of validity (0.05≤a/W≤0.95). A comparative study performed by Tyson et al [11], determined a very small difference between the two definitions in an interval of 0.1≤a/W≤0.8. Wang et al [9] also noted a small difference between the two methods, although they concluded that the 5 th order polynomial as proposed by Cravero was the most precise.…”

Section: Unloading Compliancementioning

confidence: 99%

“…Although the material is at a plane strain condition at the center, the sides are in a plane stress condition. Since the compliance is a function of displacements everywhere in the specimen and not just around the crack tip, Tyson et al [11] concluded that it is best to use the plane stress condition, because the constraint for the major part of specimens in tension is closer to plane stress.…”

Section: Unloading Compliancementioning

confidence: 99%

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Evaluation of ductile tearing for API-5L X70 pipeline grade steel using SENT specimens

Ohms

Rosado

Waele

2015

SCAD

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Pipelines in harsh environments may be subjected to large deformations. Classic stress-based design needs to be complemented with strain-based design. An important parameter in the design is the crack growth resistance. SENT testing (Single Edge Notch Tension) allows to determine the so-called material’s tearing resistance curve. Very recently the first standard on SENT testing, BS 8571:2014, has been published. SENT testing is however still subject to extensive research and different approaches with respect to eg. notch placement, crack extension measurement and analysis exist. In this paper two methods for calculating crack extension based on the unloading compliance procedure are used and compared, proving that they show little difference. This is performed on an API-5L X70 steel grade and this for different configurations, namely an inner diameter notch and a through thickness notch. The results showed little difference between the different configurations, although the inner diameter showed higher crack growth resistance. Furthermore, the results are compared to visual observations of the fracture surfaces and a hardness map. The fracture surfaces corresponded to the obtained resistance curves. However, no real correlation between the hardness map and the other results could be seen.

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Section: Crack Growthsupporting

confidence: 86%

Section: Unloading Compliancementioning

confidence: 99%

Section: Unloading Compliancementioning

confidence: 99%

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Evaluation of ductile tearing for API-5L X70 pipeline grade steel using SENT specimens

Ohms

Rosado

Waele

2015

SCAD

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“…Tyson et al [16] suggest that it is because the constraint for the bulk of the specimen is closer to plane stress than to plane strain, although the crack tip constraint is close to plane strain. Tyson et al [16] suggest that it is because the constraint for the bulk of the specimen is closer to plane stress than to plane strain, although the crack tip constraint is close to plane strain.…”

Section: + Y/eb^cimentioning

confidence: 99%

Evaluation of Two Low-Constraint Toughness Test Methods in a Single Specimen

Park

Gravel

Arafin

et al. 2014

Journal of Engineering Materials and Technology

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In previous studies, the single- and double-clip gauge methods were successfully consolidated in a single-edge notched tension (SE(T)) single specimen so that crack tip opening displacement (CTOD) values obtained from both SE(T) methods could be compared under identical test conditions. The current study investigated the effect of unloading compliance crack size equations on resistance curves obtained from both gauging methods combined in a single specimen. It was found that the unloading compliance crack size equations of Cravero and Ruggieri and the single clip gauge method predict crack sizes well within approximately 2% error in average. Two CTOD-resistance curves obtained from both gauging methods produce approximately the same results until peak loads, and thereafter the curves deviate. The results obtained from the double clip gauge method are consistently higher than those from the single clip gauge, although the difference between two resistance curves is reduced when the same unloading compliance crack size prediction procedure is used. This observation is very important within the framework of engineering critical assessment (ECA) and defect assessment procedures. An “apparent” higher resistance curve will generate larger tolerable defects thereby reducing the conservatism of an ECA analysis.

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“…þ 83:52325u 4 À 39:11201u 5 ; 0:1 a=W 0:7 (9) Note that in the corresponding original publications, 18-23 E 2D was taken as E in Eqs (6a)- (8), and E′ in Eqs (5a), (5b) and (9). Several studies 20,26,28 have revealed that using E instead of E′ in Eqs (5a), (5b) and (9) can lead to more accurate predictions of a/W for specimens with B/W = 1. Based on this, E 2D was set to equal E in Eqs (5a)- (9) in the present study.…”

mentioning

confidence: 99%

Numerical investigation of compliance equations used in the R‐curve testing for clamped SE(T) specimens

Huang

Zhou

2015

Fatigue Fract Eng Mat Struct

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Three‐dimensional finite element analysis of clamped single‐edge tension specimen is performed to examine the accuracy of the crack‐mouth opening displacement compliance equations reported in the literature. The analysis covered both plane‐sided and side‐grooved specimens with a wide range of specimen configurations including nine relative crack lengths (a/W) ranging from 0.1 to 0.9 and seven relative thicknesses (B/W) ranging from 0.25 to 4. Based on the finite element analysis results, the crack length/compliance modification factors (ρ(a/W) and ρ(BCE)) are developed to improve the accuracy of the compliance equations. The results of this study can improve the accuracy of the experimentally determined J‐R and CTOD–R curves using the single‐specimen technique and single‐edge tension specimens.

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Elastic compliance of single-edge-notched tension SE(T) (or SENT) specimens

Cited by 8 publications

References 3 publications

Evaluation of ductile tearing for API-5L X70 pipeline grade steel using SENT specimens

Evaluation of ductile tearing for API-5L X70 pipeline grade steel using SENT specimens

Evaluation of Two Low-Constraint Toughness Test Methods in a Single Specimen

Numerical investigation of compliance equations used in the R‐curve testing for clamped SE(T) specimens

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