Issue 62

S.Bouhiyadi et alii, Frattura ed Integrità Strutturale, 62 (2022) 634-659; DOI: 10.3221/IGF-ESIS.62.44





     cr cr

E

 

   

'

 

f

(21)

f

c

t

 





   1 (200

with

 '

'

f

f MPa [29]

0.33

(22)

t and f ᇱ ୡ : ultimate compressive strength. Therefore   ' 0.33 11.45 1.116 t f MPa and c

'

t f E

  rc

according to (Fig. 19)

(23)

c

Then

 1.116 0.000658 1696.29

  rc

Figure 19: The curve of the stress-strain function (tensile stiffening) [29].

To understand the interaction forces between the solidified grains in the block, the apparent viscosity was introduced to characterize the strength of the solidified grains in the moving block. In addition, the decrease in solid viscosity generally indicates an increased adhesion property of the grains [32]. For our case, the compressed earth block undergoes compression in the manufacturing phase, which decreases the viscous state of the grains. This means that the cohesive forces caused by surface sintering and particle melting increase, which can lead to agglomerated and bonded grains, while non-zero viscosity suggests that the solidified grains in the block have no bonding ability [32]. Furthermore, W. Hong, [21] proposes that a zero value of viscosity is suggested as an input for the mechanical parameters of solids in ABAQUS. Then a proposal of 0 Pa.s value of viscosity is accepted for compressed earth blocks.

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