A Fracture Test Method for Mode I Fracture Of Thin Metal Materials

1996 ◽  
Vol 24 (5) ◽  
pp. 316
Author(s):  
DR Petersen ◽  
RE Link ◽  
B Cotterell ◽  
MC Sim ◽  
G Amrutharaj ◽  
...  
Keyword(s):  
Thin Metal ◽  
Test Method ◽  
Mode I ◽  
Fracture Test ◽  
Mode I Fracture ◽  
Metal Materials

A novel Mode I fracture test for stitched composite laminates

2000 ◽  
Author(s):  
Leishan Chen ◽  
Peter Ifju ◽  
Bhavani Sankar
Keyword(s):  
Composite Laminates ◽  
Mode I ◽  
Fracture Test ◽  
Mode I Fracture

A New Idea of Pure Mode-I Fracture Test of Bonded Bi-Materials

2010 ◽  
Author(s):  
Zhenyu Ouyang ◽  
Gefu Ji ◽  
Guoqiang Li ◽  
Su-Seng Pang ◽  
Samuel Ibekwe
Keyword(s):  
Mixed Mode ◽  
Dissimilar Materials ◽  
Test Method ◽  
Interface Fracture ◽  
Mode I ◽  
Mixed Mode Fracture ◽  
Pure Mode ◽  
Fracture Test ◽  
Engineering Structures ◽  
Material Systems

Bi-material systems in which two dissimilar materials are adhesively joined by a thin adhesive interlayer have been widely used in a variety of modern industries and engineering structures. There are two fundamental issues that need to be adequately addressed: (1) Fracture of bonded bi-materials is mixed mode: Mode-I (pure peel) and Mode-II (pure shear). Fracture test implementation of bi-material systems with the traditional Mode-I methods will induce a noticeable mixed mode fracture due to the disrupted symmetry by the bi-material configuration; (2) The popular cohesive zone models (CZMs) for accurate fracture simulations require more than a single parameter (toughness) as is the case in the traditional linear elastic fracture mechanics (LEFM). Thus, J-integral is highly preferred. It can not only capture more accurate toughness value by considering the root rotation effect, but also facilitate the experimental characterizations of the interfacial cohesive laws, which naturally include all required parameters by CZMs. Motivated by these two important issues, a novel idea is proposed in the present work to realize and characterize the pure Mode-I nonlinear interface fracture between bonded dissimilar materials: Despite the approximation with the elementary beam theories, the accuracy is validated by numerical simulations. The proposed approach may be considered as a promising candidate for the future standard Mode-I test method of adhesively bonded dissimilar materials due to its obvious simplicity and accuracy.

scholarly journals Large Displacement J-Integral Double Cantilever Beam (DCB) Test Method for Mode I Fracture Toughness

2020 ◽  
Author(s):  
Joshua Gunderson
Keyword(s):  
Fracture Toughness ◽  
Double Cantilever Beam ◽  
Test Method ◽  
Large Displacement ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Linear Elastic ◽  
True Value ◽  
Nonlinear Elastic

The J-integral is used to develop an alternative double cantilever beam (DCB) test method for the Mode I fracture toughness suitable for both small and large displacements. The current focus is the experimental determination of the Mode I interlaminar fracture toughness of composite materials, but the method is generally applicable to other similar tests and material systems, such as to the Mode I fracture toughness of adhesives. A series of five identical specimens are tested to compare the linear-elastic fracture mechanics method recommended by ASTM, which makes use of linear beam theory with root rotation, large displacement, and end block corrections, with the new nonlinear-elastic and elastic-plastic fracture mechanics method, which does not require these corrections. Experimental results show excellent agreement between the two methods over a series of five tests of primarily linear-elastic DCB specimens subjected to moderate to large displacements as defined in the ASTM standard. Furthermore, an agreement is found between the results of the derivations for the two methods being compared, whereby the large displacement equation for JIc presented in this work is identical to the equation given by J. G. Williams (1987) and which he found to be the true value of GIc. It is the true value of GIc that the large displacement and root rotation correction factors were intended to approximate, and the test method presented here allows for direct measurement of its parameters and evaluation. This method has the added benefit that specimens can be primarily linear-elastic or nonlinear-elastic at the crack tip and may extend to those that are elastic-plastic at the crack tip.

A new mode I fracture test for composites with translaminar reinforcements

2002 ◽  
Vol 62 (10-11) ◽  
pp. 1407-1414 ◽  
Author(s):  
Leishan Chen ◽  
Bhavani.V. Sankar ◽  
Peter.G. Ifju
Keyword(s):  
Mode I ◽  
Fracture Test ◽  
Mode I Fracture

scholarly journals Effect of Testing Method Type and Specimen Size on Mode I Fracture Toughness of Kimachi Sandstone

2019 ◽  
Vol 135 (5) ◽  
pp. 33-41 ◽  
Author(s):  
Minami KATAOKA ◽  
Yuzo OBARA ◽  
Leona VAVRO ◽  
Kamil SOUCEK ◽  
Sang-Ho CHO ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Specimen Size ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Testing Method

A Study on Governing Parameters to Improve the Results of Caustic Applied to Mode-I Fracture Mechanics Problems

1994 ◽  
Vol 23 (1) ◽  
pp. 1-11 ◽  
Author(s):  
P. Rathinam ◽  
R. Narayanan ◽  
G. Jayarama Rao
Keyword(s):  
Fracture Mechanics ◽  
Mode I ◽  
Mode I Fracture

scholarly journals Comparative study of elastic properties and mode I fracture energy of carbon nanotube/epoxy and carbon fibre/epoxy laminated composites

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Jyotikalpa Bora ◽  
Sushen Kirtania
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibre ◽  
Fracture Energy ◽  
Elastic Properties ◽  
Volume Fraction ◽  
Laminated Composites ◽  
Laminated Composite ◽  
Fe Analysis ◽  
Mode I ◽  
Mode I Fracture

Abstract A comparative study of elastic properties and mode I fracture energy has been presented between conventional carbon fibre (CF)/epoxy and advanced carbon nanotube (CNT)/epoxy laminated composite materials. The volume fraction of CNT fibres has been considered as 15%, 30%, and 60% whereas; the volume fraction of CF has been kept constant at 60%. Three stacking sequences of the laminates viz.[0/0/0/0], [0/90/0/90] and [0/30/–30/90] have been considered in the present analysis. Periodic microstructure model has been used to calculate the elastic properties of the laminated composites. It has been observed analytically that the addition of only 15% CNT in epoxy will give almost the same value of longitudinal Young’s modulus as compared to the addition of 60% CF in epoxy. Finite element (FE) analysis of double cantilever beam specimens made from laminated composite has also been performed. It has been observed from FE analysis that the addition of 15% CNT in epoxy will also give almost the same value of mode I fracture energy as compared to the addition of 60% CF in epoxy. The value of mode I fracture energy for [0/0/0/0] laminated composite is two times higher than the other two types of laminated composites.

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