Measurement of Elastic Modulus of PUNB Bonded Sand as a Function of Temperature

Measurement of Gas Evolution from PUNB Bonded Sand as a Function of Temperature

“…The PUNB bonded sand specimen composition and preparation procedure follow those employed by Thole and Beckermann [32]. Specimens of bonded sand were prepared from IC55 silica lake sand, black iron oxide (BIO), and a PUNB binder system.…”

“…It is important to note that the PUNB bonded sand samples had a porosity of about 33% [32]. The presence of even small amounts of air in the samples would create non-ideal conditions for bonded sand pyrolysis, which needed to be avoided.…”

Mechanical properties of chemically bonded sand core materials dipped in sol–gel coating impregnated with filter dust: novel approach to improve casting quality

“…This leads to a phenomenon known as simultaneous dual stress effect. The stress s, strain e and modulus of elasticity E can be calculated from the following flexural strength equations 21,22 s~3 PL 0 2lb 2 (2) and…”

“…1 The curves in the figure were linearly fitted, and the slope of the linear portion was taken to represent the stiffness of the specimens. 21 The deduced stiffness of all the specimens studied and the corresponding determination coefficients (regression coefficients) are presented in Table 5. From the results presented in the table, it can be inferred that the coating, the dipping time and the percentage solid content have negligible effect on the stiffness of the chemically bonded sand core materials.…”

Prediction of distortions and pattern allowances in steel sand castings

“…This is particularly true at high temperatures where the majority of distortions can be expected to occur. These deficiencies have spurred researchers to study high-temperature properties of bonded sands, including compressive strength [9], tensile strength [10], and elastic modulus [11]. Compressible materials such as sand should be modeled using a constitutive law that considers pressure-dependent yield behavior.…”