Fracture Parameters by Polylinear Tension-Softening Analysis

Kitsutaka, Yoshinori

doi:10.1061/(asce)0733-9399(1997)123:5(444)

Cited by 79 publications

(23 citation statements)

References 8 publications

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“…Based on the results, mode I fracture of concrete is modeled into a fictitious crack model to estimate a TSD using polylinear approximation [4]. A L-CMOD curve is then estimated by analysis from the estimated TSD to minimize the gap with the L-CMOD curve determined from measurement during Closed loop system Loading fracture toughness testing.…”

Section: Poly-linear Approximation Of Tsdmentioning

confidence: 99%

“…Three specimens were used for each set of conditions, and compression tests were conducted using specimens after completion of fracture toughness testing. Tension softening diagrams (TSDs) were estimated using poly-linear approximation [4] based on the L-CMOD curves obtained from fracture toughness tests. The fracture energy, G F , and initial cohesive stress, F t , were also derived therefrom.…”

Section: Introductionmentioning

confidence: 99%

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Crack-Resistant Properties of Concrete Subjected to Combined Deterioration by Heating and Carbonation

Kitsutaka¹,

Matsuzawa²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Concrete structures for nuclear power plant may be subjected to the heating action and carbonation action for a long period. Many studies have already reported that the concrete structure subjected to the heating action can be retained by maintaining the heating conditions of not more than 65°C under general control standards for nuclear power plant. The effect of the heating should be considered to discuss the long-term safety and durability of concrete structures in the viewpoint of compressive strength, however the fracture properties of concrete, which were important to discuss the crack resistance for the nuclear power plant, are not yet to be clarified. This paper reports on the investigation into the fracture properties of mortar subjected to the effects of heating and carbonation action. The water-cement ratios (W/Cs) of mortar used in this experiment is set to 0.6, 0.8, 1.0. Mortar specimen size was 40mm x 40 mm x 160 mm. After the 28-day water curing at 20°C, specimens were set in the heating condition of 20°C and 65°C and carbonation acceleration conditions of 0% and 5%. After the heating and carbonation acceleration, three-point bending tests were conducted to measure the load versus crack mouth opening displacement (L-CMOD) curves. The fracture energy was estimated by the tension softening diagram (TSD) calculated by the L-CMOD curve based on the poly-linear inverse analysis. Effects of heating and carbonation on the fracture parameters were discussed.

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Section: Poly-linear Approximation Of Tsdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack-Resistant Properties of Concrete Subjected to Combined Deterioration by Heating and Carbonation

Kitsutaka¹,

Matsuzawa²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…Distance along the crack, mm The only forward solution for this problem by (2) with linear bending stress is the crack profile (firm line) in Fig. 5.…”

Section: Forwand Analysismentioning

confidence: 99%

Inverse Analysis to determine re-bars' force from external crack widths measurement

Islam

Matsumoto

2004

Journal of applied mechanics

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This paper focuses on the stability of fracturing process in reinforced concrete beams and derives a fracture mechanics based transformation between crack opening displacements (COD) and re-bars force. Bridged crack model is adopted which considers distinct phenomena for damage process in concrete and bridging of cracks by re-bars. The derived transformation yields crack profiles for known re-bar force determined by either RC section analysis or computations having fracture mechanics based approach. Inverse of the integral transformation is ill-posed when experimentally collected COD's are not exact. Tikhonov method of regularization is followed to compute re-bar force from COD where the extremals of the Tikhonov functional is determined numerically. A numerical example proving the applicability of this method with different noise levels are demonstrated. It is observed that current method of numerical inverse analysis on external surface COD can satisfactorily determine location and force of re-bars in the beam cross-section within limited tolerance of noise in data. Application of this method enables the maintenance engineers to retrieve inner cross-sectional information from outer measurements in a non-destructive way.

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“…Since practically measured CODs are susceptible to data perturbation, the inverse problem becomes illposed and needs a regularization method to obtain a unique and stable solution. Direct problems of similar fracture mechanics based transformation in context of many engineering materials of various geometry and loading conditions were covered by Marshall et al 1985, Marshall and Cox 1987, Cox and Marshall 1991a, McMeeking and Evans 1990, Buchanan et al 1997, Fett et al 1996and Kitsutaka 1997. These direct problems were solved for CODs in fibrous composites and quasi-brittle materials (e.g., concrete, rocks, ceramics) assuming continuous bridging law functions (p -u relation, p being the crack bridging force and u the CODs).…”

Section: Introductionmentioning

confidence: 99%