On the Use of the Double Cantilever Beam Specimen for Determining the Plane Strain Fracture Toughness of Metals

1967 ◽  
Vol 89 (3) ◽  
pp. 525-532 ◽  
Author(s):  
R. G. Hoagland
Keyword(s):  
Fracture Toughness ◽  
Plane Strain ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Elastic Strain Energy ◽  
Strain Energy Release ◽  
Crack Arrest ◽  
Specimen Geometry ◽  
Beam Specimen ◽  
Dcb Specimen

The double cantilever beam (DCB) specimen has considerable potential for application to fracture toughness testing because it facilitates the determination of a number of plane strain toughness data from a single specimen of moderate size. The relationship between the elastic strain energy release rate, load, and extension for a given crack length is obtained from compliance tests and the dependence of this relationship on the specimen geometry is presented. The effect of changing specimen geometry on the fracture toughness is also presented. Comparison with plane strain toughness data obtained by other techniques on identical materials is made to evaluate the effectiveness of the side grooves in the specimen for providing plane strain conditions at fracture. Finally, consideration of the meaning of the stress intensity at crack arrest in the DCB specimen indicates that this parameter is dependent on specimen geometry as well as the material properties.

scholarly journals Influence of Root Rotation on Delamination Fracture Toughness of Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
V. Alfred Franklin ◽  
T. Christopher ◽  
B. Nageswara Rao
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Test Results ◽  
Spring Stiffness ◽  
Critical Fracture ◽  
Delamination Fracture ◽  
Dcb Specimen ◽  
Material Systems ◽  
Good Agreement

Large deviations have been observed while analysing composite double cantilever beam (DCB) specimens assuming each cracked half as a simple cantilever beam. This paper examines the effect of rotational spring stiffness(K)on the critical fracture energy(GIC)considering nonzero slope at the crack-tip of the DCB specimen by modelling each cracked half as the spring-hinged cantilever beam. The critical load estimates of DCB specimens fromGICare found to be in good agreement with in-house and existing test results of different composite material systems.

Fracture toughness measurement of mild steels with reinforced-double-cantilever-beam specimen

1976 ◽  
Vol 11 (4) ◽  
pp. 195-201 ◽  
Author(s):  
C L Chow ◽  
R C Owen
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Graphical Representation ◽  
Crack Opening ◽  
Beam Specimen ◽  
Opening Displacement ◽  
Extension Force ◽  
Tension Testing

The fracture toughness of mild steels was successfully determined under monotonic and cyclic crack propagation. The conditions governing the valid measurement of fracture toughness were satisfied by r.d.c.b. (reinforced-double-cantilever-beam) specimens, and photomicrographic evidence and compliance measurements verified the yielding of the specimens during cracking confined to the crack tip. Measurements of fracture toughness of EN 24 (BS 970 817M40) steel were made on the r.d.c.b., c.o.d. (crack-opening displacement) and c.k.s. (standard tension testing) specimens and the results verified the validity of the r.d.c.b. testing method. The compliance measuring approach was used to determine the rate of fatigue crack propagation and was found satisfactory using the graphical representation based on change in crack extension force Δ G. It was observed that the grain size of the steel has definite effects on its fracture toughness.

A tapered bondline thickness double cantilever beam (DCB) specimen geometry for combinatorial fracture studies of adhesive bonds

2014 ◽  
Vol 55 ◽  
pp. 155-160 ◽  
Author(s):  
Shantanu R. Ranade ◽  
Youliang Guan ◽  
Donatus C. Ohanehi ◽  
John G. Dillard ◽  
Romesh C. Batra ◽  
...  
Keyword(s):  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Specimen Geometry ◽  
Adhesive Bonds ◽  
Dcb Specimen ◽  
Bondline Thickness

Mode I Fracture Toughness of a Tri-Layered Structure with Interfacial Crack

2011 ◽  
Vol 71-78 ◽  
pp. 1440-1443
Author(s):  
Shiuh Chuan Her ◽  
Wei Bo Su
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Layered Structure ◽  
Material Properties ◽  
Double Cantilever Beam ◽  
Interfacial Crack ◽  
Beam Theory ◽  
Strain Energy Release ◽  
Mode I ◽  
Mode I Fracture Toughness

Analytical model based on the Bernoulli beam theory and fracture mechanics have been developed to predict the fracture toughness of a tri-layered beam with interfacial crack. In this work, a double cantilever beam test is conducted to determine the fracture toughness of mode I. The strain energy release rate for the double cantilever beam is expressed as a function of the material properties and thickness of the tri-layer beam. The analytical solution is validated with the finite element result. Good agreement demonstrates that the proposed approach is able to provide an efficient way for the calculation of the fracture toughness of a multi-layered structure. The effects of material properties and thickness between the adjacent layers of the interfacial crack are examined through a parametric study.

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