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Stress-Crack Opening Relation and Size Effect in Concrete
Published in Alberto Carpinteri, Applications of Fracture Mechanics to Reinforced Concrete, 2018
In order to study typical high strength concrete used in the industry, the investigation was conducted on material obtained directly from a batch mixed for the construction of a high rise building in downtown Chicago. The concrete mix was designed to exceed a 28-day compressive strength of 83 MPa. Silica fume and fly ash were used as mineral admixtures. The maximum aggregate size (dmax) was 9.5 mm. The details of the mix composition are given in Table 2. The average 14-day compression strength (fc14’) (cylinder 102 mm × 204 mm) was 85·5 MPa. Geometrically similar beams of four different sizes were cast from the same batch of concrete. The geometry is shown in Fig. 6. All specimens were 38·1 mm thick. The depths were d = 304·8, 152·4, 76·2 and 38·1 mm. For more details see [3].
Reciprocating Engines
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
For stationary engines, which rest on a substantial foundation, two-piece construction is common. The lower section, or bedplate, forms a base, supports the main bearings, encloses the lower part of the crankcase, and forms a sump for lubricating oil. The upper section, or center-frame, includes the upper part of the crankcase and the cylinder block in which the cylinders are supported. Automotive type engines have a one-piece cylinder block and are typically constructed of cast iron. Figure 9-4 shows the center-frame of a large capacity 14-cylinder, V-type, four-stroke-cycle engine.
William Weir: architect of air power? The First World War chapter
Published in The International Journal for the History of Engineering & Technology, 2023
This brilliant work was incorporated into the design of a 14-cylinder, twin row radial engine, the R.A.F.8. Figure 1 shows the general arrangement drawings for this project, which were finalised between September and December 1916, suggesting bench running might have commenced in mid 1917. It was not to be. Disillusioned by the campaign against the Factory, the design team headed by F. M. Green, including Heron, left the R.A.F. in January 1917 to take up roles at the motor vehicle firm Siddeley-Deasy, which was building aeroengines under the leadership of an autocratic former bicycle designer, John Siddeley. In its original form, the R.A.F.8 was never built.