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Hartman, H. (author)
doctoral thesis 1925
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Hartman, M.E. (author)
Document(en) uit de collectie Chemische Procestechnologie
report 1958
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Hartman, A. (author)
Single row riveted double cover plate joints in alclad 2024-T aluminium alloy sheet and 2117-T snap rivets were loaded in fluctuating tension with cycle ratio's from 0.25 to 0,79. The specimens were then tested by a static rotation test to determine the effect of the pre-loading in fatigue on the friction between the sheets. The friction had...
report 1961
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Hartman, A. (author)
Electron microscopical investigation indicated that in Redux bonding of chromic acid anodized 2024-T alclad mechanical interlocking between the oxide and the adhesive occurred. Pickling in chromic sulfuric acid solutions improved the homogeneity of the aluminium surface and increased the roughness of the metal surface on a molecular scale.
report 1961
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de Rijk, P. (author), Hartman, A. (author)
Light alloy specimens consisting of a 2 mm 2024-T load sheet reinforced with doubler plates of 1 mm were loaded in fluctuating tension. Redux and Metlbond 4021 were used as adhesives with glueline thicknesses of about O.05 and 0,5 mm. The Metlbond bonded specimens had a higher endurance than the Redux bonded specimens indicating that in...
report 1962
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Hartman, A. (author), de Jonge, J.B. (author)
A series of Redux-bonded single and double lap-joints with non-porous gluelayers of various glueline thicknesses were tested ultrasonically by means of the Fokker Bond Tester. Tensile shear tests were carried out after completion of the ultrasonic tests. Bond Tester indications were in good agreement with theoretical results , indicating the...
report 1962
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Hartman, A. (author), Jacobs, F.A. (author), de Rijk, P. (author)
Fatigue tests on 2024-T4 alclad double row riveted single lap joints at fluctuating tension with a mean stress in the nett section of 9.0 kg/mm2 and stress amplitudes ranging from 8.6 to 3.0 kg/mm^ did not show any significant difference in endurance of similar specimens with a size ratio li2,66.
report 1962
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Hartman, A. (author), Jacobs, P.A. (author)
A comparison has been made between the fatigue strength at fluctuating tension of 2024-T3 alclad double row riveted single lap joints at room temperature in the as fabricated condition and at 150°C after stress-aging at this temperature for 100 hours. The tests showed an appreciable decrease in endurance of the specimens tested at 150°C,...
report 1963
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Hartman, A. (author), Jacobs, F.A. (author)
The propagation has been studied of fatigue cracks in 2024-T3 alclad sheet under fluctuating tension in different atmospheres. Of the principal constituents of air water vapour had a much more severe effect than oxygen; in wet -pure argon the endurance was much shorter than in dry pure oxygen. In air, other circumstances remaining unaltered, the...
report 1964
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Hartman, A. (author)
report 1964
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Hartman, A. (author), Jacobs, F.A. (author), van der Vet, W.J. (author)
report 1965
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Hartman, A. (author), Jacobs, F.A. (author), van der Vet, W.J. (author)
Several single lap Joints in clad 2024-T3 and 7075-T6 alitainium alloy with two rows of rivets or Huclcbolts have been evaluated in respect of their fatigue strength properties, both in tests with constant load amplitude and in tests with a programmed load sequence based on a gust spectrum. The results showed that: 1) The replacement of...
report 1965
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Hartman, A. (author)
report 1966
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Hartman, A. (author), Jacobs, F.A. (author), Nederveen, A. (author), de Rijk, P. (author)
The investigation on the propagation of fatigue cracks in aluminium alloy sheet under fluctuating tension comprised four parts. (1) Tests to determine the combined effects of the humidity of the air and the lead frequency (clad 2024-T3 and 7075-T6). (2) Tests to determine the effect of water. (3) Tests to determine the effect of wetting with a...
report 1967
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Hartman, A. (author), Schijve, J. (author)
Berekeningen zijn gemaakt over de plaatbuiging die optreedt in op trek belaste lapnaden en enkele stripnaden met resp. 2 en 2 x 2 rijen nagels. De berekeningen zijn uitgevoerd voor plaatdikten van 1 en 2 mm en enkele waarden voor de nagelrij-afstanden. Bij de enkele stripnaad is bovendien gerekend voor een gestaffelde strip en enige diktes van...
report 1968
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Hartman, A. (author)
The chromic acid and the sulfuric acid anodic coatings have been compared with respect to their effect on the endurance of mildly notched 2024-T3 Alclad specimens in programme tests based on a gust spectrum and in some constant-load amplitude tests. Factors studied were: anodizing-tooling sequence, sealing and painting, presence of cracks in the...
report 1968
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Hartman, A. (author)
Manufacturing variables of riveted joints like riveting procedure and surface treatment of the metal prior to the riveting, were studied with respect to their influence on the endurance of the joint under fluctuating tensile loading.
report 1968
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Hartman, A. (author), Schijve, J. (author)
Six types of riveted specimens including lap joints and single and deuble strap joints have been compared both, in constant-load-amplitude tests and in programme tests. In the programee tests, based on a gust load spectrum, the endurance of the double strap joint specimens was about three times as long: as that of the single lap joint and the...
report 1969
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Broek, D. (author), Hartman, A. (author), Nederveen, A. (author)
A few preliminary tests on 2024-T3 material were carried out allowing electron fractographical examination of the fracture features of fatigue crack growth in vacuum. Fatigue striations were generally not formed in vacuum: the fracture surface consists of irregular fine slip steps and coarse slip steps which show a certain periodicity. The...
report 1971
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Hartman, A. (author), Lievers, J.W. (author), van der Vet, W.J. (author)
Stress corrosion craxking of 7075 aluminium alloy was investigated by means of bend tests on short transverse pre-cracked specimens. It was found that in 3 % NaCl-solution the S.C.C. behaviour was neither significantlly affectedd by the pH in the range 3-10 nor in almost neutral solution by addition of chromate. In distilled water on the other...
report 1971
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