Pellini Drop Weight Tester

The drop weight test as described by W. S. Pellini is used to investigate the tendency to brittle fracture of steels for comparative evaluation of crack arrest behavior to ASTM E208 and SEP 1325. 
Pellini drop weight test

W.S. Pellini Drop Weight Test

During the W.S. Pellini test, weights fall onto a rectangular flexure specimen supported at both ends, causing a brittle fracture on the tensile side of the specimen within a prescribed total deflection. This brittle fracture is initiated by a notched welding bead laid on this side and known as the crack starter.

It is then determined whether the brittle fracture caused by the artificial crack-starter spreads as far as one of the two side faces of the specimen or is arrested beforehand. If the fracture extends to one of the two side-faces, the specimen is regarded as broken.

Technical Overview

  • Pellini drop weight testers are available in 550J and 1650J versions. 
  • The maximum fall height is 1 meter or 1.3 meters.
  • In accordance with standards (ASTM E208 and SEP 1325), the prescribed drop-energies are obtained by the simple use of weights. Drop energy is calculated automatically.

Advantages & features

  • Modular "building block" system with two sizes
  • Interchangeable flexure inserts and fixtures.
  • Electrical and mechanical test-area safeguards with safety circuit - the test does not begin until all safety switch contacts have been interrogated.
  • Independent pneumatically operated safety interlocking safeguards test area against accidents
  • Touchscreen operation with electronic display of drop height, drop energy, drop weight and impact velocity (theoretically)
  • The steplessly adjustable drop height is automatically achieved after input of drop weight and drop energy
  • No extra foundation required. Floor must be capable of carrying a specific load of 0.3 kg/cm²

Technical data

Model

P550

P1650

Item No.

022317

024571

Drop energy

340 ... 550

340 ... 1650

J

Drop height max.

1000

1300

mm

Drop weight

24.8 ... 56

24.8 ... 130

kg

Total weight

2534

2620

kg

Drop speed max.

4.4

5

m/s

Dimensions

A – height approx.

3074

3374

mm

B – width approx.

1550

1550

mm

C – depth approx.

840

840

mm

Power rating

2

2

kW

Compressed air

8

8

bar

Specimens

P1

no

yes

P2

yes

yes

P3

yes

yes

P4

yes

yes

Specimen dimensions

SEP specimen dimensions 

Thickness

Width

Length  
25 ± 0.3

mm

90 ± 2.0

P1

360 ± 10
19 ± 0.2

mm

50 ± 1.0

P2

130 ± 10
16 ± 0.2

mm

50 ± 1.0

P3

130 ± 10
13 ± 0.2

mm

50 ± 1.0

P4

130 ± 10

Specimen dimensions ASTM

Thickness

Width

Length
15.9

mm

51

P3

127

19

mm

51

P2

127
25.4

mm

89

P1

356

Design

W.S. Pellini drop weight test design
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