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Published: 01 January 1996
Fig. 27 Graphical solution for R-curve method using F-curves for uniaxially loaded sheet with central crack More
Image
Published: 01 January 2000
Fig. 5 Application of the R -curve method More
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002416
EISBN: 978-1-62708-193-1
... strength and tensile strength. The article reviews low velocity impacts in aircraft structures in terms of resin toughness, laminate thickness, specimen size and impactor mass, and post-impact fatigue. It explains the tension strength analysis, such as linear elastic fracture mechanics and R-curve methods...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003312
EISBN: 978-1-62708-176-4
... methods developed to characterize the fracture behavior of brittle solids with examples. These include the fracture toughness test method and R-curve test method at ambient and elevated temperatures. The article also includes information on the evaluation of fracture-toughness test results...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002380
EISBN: 978-1-62708-193-1
... testing, J-R curve evaluation, and crack tip opening displacement (CTOD) method. Other methods used include the combined J standard method, the common fracture toughness test, transition fracture toughness testing, and the weldment fracture testing method. crack initiation fracture toughness...
Image
Published: 01 January 2000
Fig. 20 Indentation strength (IS) fracture test method for R -curve behavior where observed flexural strength is a function of indentation force in a series of two experiments. Specimens for A included residual stress of indentation; specimens for B had the residual stress annealed out More
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006457
EISBN: 978-1-62708-210-5
...-plastic fracture, namely R-curve concept, J-integral concept, and crack tip opening displacement method. The article considers the primary measures used to assess the toughness of aluminum alloy castings and wrought alloys: notch toughness, tear resistance, and plane-strain fracture toughness...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003306
EISBN: 978-1-62708-176-4
... a single value for this fracture toughness, a point on the R -curve must be chosen. This usually involves a construction procedure. The ASTM E 399 K Ic standard fracture toughness test method, which is described next, gives an example of a construction procedure that is used to get a single-point...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003328
EISBN: 978-1-62708-176-4
...-Method) This section describes a calculation method for which the strength values determined by tensile testing are required as material characteristics as well as fracture toughness values. This is demonstrated using the R 6-method and the R -curve method. It is indeed possible in fracture...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003305
EISBN: 978-1-62708-176-4
... basic methods of EPFM include the crack-tip opening displacement (CTOD), the J -integral, and the R -curve methods. These tests are intended to provide specialized measurements of fracture properties as follows: CTOD: full range of fracture toughness; for slow loading rates J -integral...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003311
EISBN: 978-1-62708-176-4
... different silicon nitride (Si 3 N 4 ) materials, A, B, and C. The R -curves were measured using short bar chevron notch methods. Material A is a hot pressed commercial Si 3 N 4 (SN-84H by NGK Technical Ceramics) with low fracture toughness; it results in flat R -curve behavior. Materials B and C, which...
Image
Published: 01 January 2000
Fig. 28 R -curves for materials tested at room and elevated temperature usign the chevron notch beam (CNB) method. (a) Flat R -curves. (b) Nonlinear R -curves. Source: Ref 49 More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003644
EISBN: 978-1-62708-182-5
..., potentiodynamic polarization curves collected in close vicinity of E corr are used for this purpose. ASTM G 59, “Standard Practice for Conducting Potentiodynamic Polarization-Resistance Measurements,” deals with experimental procedures for determining R p according to Eq 1 . This method describes...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005789
EISBN: 978-1-62708-165-8
..., the surface heat-flux density, q s ( t ), is considered to be positive when the probe cools, which is customary in industrial applications. To determine α as a function of time in Eq 12 , a temperature curve T n ( t ) is measured by a thermocouple located at a point r = r n near the surface...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003310
EISBN: 978-1-62708-176-4
... incapable of significant plastic deformation (e.g., polystyrene). ASTM D 6068 ( Ref 25 ) describes a method for measuring J-R curves (a measure of elastic-plastic fracture toughness) for polymer specimens that are not large enough to experience conditions of plane strain during loading. However, methods...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0009218
EISBN: 978-1-62708-176-4
... and secondary creep curves ( Ref 19 , 20 , 25 , 26 , 27 , 28 ). By differentiating Eq 4 , an estimate of the creep rate ( ε ˙ c ∗ ) can be obtained: (Eq 9) ε ˙ c = ε t r ε − r t + ε ˙ m Thus, the initial creep rate ε ˙ 0 is given by: (Eq 10...
Series: ASM Handbook Archive
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001837
EISBN: 978-1-62708-181-8
... in partially oriented fracture surfaces. This section will also examine and compare direct methods for estimating the fracture surface area. An alternative to these methods is the parametric equation based on the relationship between R L and R S . Roughness Parameters Several types of roughness...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003241
EISBN: 978-1-62708-199-3
... and indenter, as shown in Table 2 . Each number is suffixed by first the letter H (for hardness), then the letter R (for Rockwell), and finally the letter that indicates the scale used. For example, a value of 60 on the Rockwell C scale is expressed as 60 HRC, and so on. Regardless of the scale used, the “set...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006910
EISBN: 978-1-62708-395-9
... ) for the construction of the crack growth resistance curve ( J-R curve) of polymers. Known as the normalization method, it relies on the representation of J vs Δ a ( Ref 38 – 40 ), trying to overcome some of the problems of the multi-specimen methodology, which are mainly based on uncertainties associated...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003513
EISBN: 978-1-62708-180-1
... is, essentially, a graphical model, shown schematically in Fig. 2 , that reflects the stress-strain curve of the material. The FAD consists of two elements: the failure assessment curve (FAC) and the failure assessment point (FAP). The collapse ratio, S r or L r , is the ratio of the applied stress...