By K.T. Chau, R.H.C. Wong, T.-f. Wong (auth.), STAVROS K. KOURKOULIS (eds.)
The fracture and failure of usual construction stones has been for a few years the worry of the engineering group and especially the c- munity of scientists operating for the recovery and conservation of stone monuments. the necessity to shield the actual stone and the requirement for reversibility of the interventions rendered the in-depth wisdom of the mechanical behaviour of either the genuine fabric and its substitutes - dispensable. This publication includes 36 papers awarded on the Symposium on “Fracture and Failure of average construction Stones” which was once geared up within the body of the “16th ecu convention on Fracture (ECF16)”. The convention happened in Alexandroupolis, Hellas on July 3-7, 2006. To my most sensible kn- ledge this can be the 1st time targeted Symposium of a ecu C- ference on Fracture is dedicated solely to the research of the fracture and failure of creating stones. The booklet includes invited papers written through best specialists within the box. It includes unique contributions about the most recent advancements within the fracture and failure of the common development stones and their program within the recovery of historic monuments. It covers a variety of topics - cluding simply mechanical elements, physico-chemical ways, appli- tions and case reviews. The papers are prepared in components with a complete of 9 chapters. half I is dedicated to merely mechanical and structural points and purposes, whereas half II is dedicated to the physico-chemical and environmental features together with thermal effects.
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Extra info for Fracture and Failure of Natural Building Stones: Applications in the Restoration of Ancient Monuments
Dead weight leading to 90% KIC is applied to the specimen. The CMOD is recorded as a function of time throughout the duration of the test. The compliance (mm/kN) can be calculated using the applied load and the corresponding CMOD. Thus, the crack length growth (a/W) at the corresponding time can be determined using Figure 7. The crack growth rate v at each time interval can be calculated using Eq. (4). v = da/dt | [(a1 – a2 )/(t1 – t2)] Figure 6. Determination of the initial slope of the load versus CMOD curve.
X Although the SCG index n obtained from DTT is in reasonable agreement with the data for granitic rocks summarized in previous studies, this Studies on Subcritical Crack Growth in Façade Rock Panel 33 value is higher than that obtained from 4PB tests, by a factor of about 3 to 4. This may be due to the different fracture mechanism activated in the two methods and the fact that the influence of the crack length on KI is disregarded in the DTT. Thus, it is worth to investigate further the influence of crack length on the results of the DTTs.
Some deviations appear only along the axis of symmetry of the notch. The comparative study of the amplification of the strain field due to the presence of different types of notches, according to both the isotropic and the orthotropic models can be carried out with the aid of Figures 16(a,b). e. the line connecting the two tips. The origin of the x-axis is the center of the specimens and its end is the tip of the notch. 9 correspond to the tips of the Ushaped and the semi-circular notch, respectively.