PSI - Issue 47

4

Abdullah Al-Ibrahim et al. / Procedia Structural Integrity 47 (2023) 426–436 Abdullah Al-Ibrahim/ Structural Integrity Procedia 00 (2023) 000–000

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as in Figure (2). Bruker Nano's GT-K Contour 3D optical profilometer was used for earlier testing to calibrate the in-situ lateral displacement indicator, which was used to measure the wear depth. An in-situ displacement indicator will be utilized to evaluate wear depth in the experiment after comparing profilometer depth results with in-situ depth measurement and finding an inaccuracy of less than 4% .

4. Results and discussion

4.1. Estimated wear volume Three different casing grades have been tested under two different contact loads (1000N and 1400N), a rotation speed of 115rpm, lubricate of oil base, and the presence and absence of the ROP. Using the calibrated displacement indicator to find the wear volume table (1) has been obtained.

Table 1 Samples Parameters and their Estimated Wear Volume

Estimated wear volume mm 3

rotation speed (rpm)

rate of penetration mm/s

sample number

casing grade

contact load (N)

lubricant

S1

0

59.176

1400

S1 ‐ A

2.5

4023.274

P110

S3

0

30.353

1000

S3 ‐ A

2.5

2676.062

S19

0

72.447

1400

S19 ‐ A

2.5

5204.060

L80

115

oil ‐ base

S21

0

44.443

1000

S21 ‐ A

2.5

3553.432 1420.828 5866.890 761.130 3853.752

S37

0

1400

S37 ‐ A

2.5

SM2535 ‐ 110

S39

0

1000

S39 ‐ A

2.5

It can be seen the wear volume has significant increases due to the ROP. In addition, it can be found when the applied load increase from 1000N to 1400N the wear volume will increase under rotational and combined sliding and rotational.

4.2. Wear mechanisms

The tested samples under various conditions as shown in Table (1) have been examined under a digital microscope and SEM to analyze and specify the different types of wear mechanisms in several locations on the surface. Moreover, the effect of ROP with the two loads for the three grades on the worn surface will be analyzed and compared.