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M10 specimens were 7.0mm, 9.0mm and The load levels at which slippage occurred
11.0mm respectively. The results of the fatigue were used as a basis for evaluating the By S. Singh (engineering
tests, load ratio R = 0.1 are shown in Figs. 9, improvement in fatigue life with the new consultant, Gaimersheim,
10 and 11. The tests were carried out using a rivets, because permanent setting occurs at Germany) and Z. Khalil (Light
high frequency resonance testing machine. these load levels. As can be seen in the Weight Design Group, Light
three diagrams, Fig.9, 10 and 11, the
Metal Competence Centre,
Fig 9
fatigue life increases by a factor of ~5.10
4
in
Ranshofen, Austria)
the case of the FF® lock bolt specimens, by
a factor of ~5.10
3
in the case of the FF®
References
blind rivet specimens and by ~10
6
with the
6mm FF® lock bolts, (difference in the
[1] Zorn, H.; Dehlke, K.: Korrelation
number of load cycles between the points of
zwischen Form- und Kraftschluß und
intersection between the load horizon and
Bauteileigenschaften an
the respective Wöhler curve) failure in all
Blindnieteverbindungen; Universität
cases occurring in the base material. The
Rostock; Abschlußbericht zum
improvements could have been even greater
AiF-Forschungsvorhaben 10429B;
1997
if materials with higher strengths had been
used for fabricating the specimens.
[2] Wanner, M.-C., Henkel, K.-M.;
Fig 11
Herzog, P; Delin, M.: Einfluss von
werkstofflichen und geometrischen
Results of fatigue tests: FF® blind rivets
Parametern auf das Tragverhalten
versus M10 bolted joints.
einer Schließringbolzenverbindung;
Universität Rostock; Abschlussbericht
zum AiF-Forschungs¬vorhaben
In the case of the M6 bolted specimens,
13878BR; 2006
frictional lock was overcome at ~4.0kN. The
M8 bolted specimens, slipped at approxi-
[3] NASM 1312-8 National Aerospace
mately 4.5kN under static load and at ~
Standard, Aerospace Industries
3.6kN under cyclic load. The corresponding
Association of America, 2001
values for the M10 bolted specimens were
Results of fatigue tests: FF® lock
8.0kN and 7.9kN. The average numbers of
bolts vs. M6 bolted joints. Material
[4] Neudel, J.: Vergleichende
the load cycles at which frictional grip was
H340, Zinc coated, thickness
Untersuchungen zum Tragverhalten
lost were 1,000, 1,454 and 1,157 respectively.
1.5+1.5+1.5mm.
Blindniet- und Puntschweißverbindun-
An increase in the testing frequency by
gen unter statischen und schwingen-
0.2Hz, denoting an increase in stiffness due
den Beanspruchungen. Diplomarbeit
to form-fit in the case of the bolted joints The comparatively large scatter in the
AUDI/TU Chemnitz 1992
and a drop in test frequency, showing results of the fatigue tests, in the case of the
fatigue in the case of lock bolt and rivet lock bolt specimens, is due to the use of
[5] Singh, S.: Austrian Patent No.:501
joints, were used as failure criteria. Since the washers with different diameters and
877, Application date: 31.Mai, 2005
number of test specimens available was thickness’ and lock rings with and without
small, the slope of the Wöhler curves was flanges. The macrographs Figure 12, show
[6] Simon, P.: Finite Elemente
adopted from older results of blind riveted that the splines are not fully formed. The
Methode unterstützte Entwicklung
specimens tested at Rostock University [2]. contact area between the mandrel and the
neuartiger formschlüssiger toler-
work piece and the mandrel and the shank
anzunempfindlicher Blindniete.
Fig 10
could easily be increased. In spite of the far
Diplomarbeit LKR Ranshofen / TU
Dresden, 2006
from optimum quality of the joints, the
improvement in the fatigue results is still
[7] ANSYS Release 8.1 Documenta-
very noteworthy. This improvement becomes
tion Preview, ANSYS, Inc, 2004
even more remarkable when it is considered
the fact that failure always occurred in the
[8] Singh, S.; Simon, P.; Khalil, Z.; R.
base material.
Gradinger: Novel Form-Actuated
Fig 12
Tolerance-Tolerant Blind Rivets –
Simulation Assisted Development.
Proceedings of the 2nd International
Light Metals Technology Conference
2005, St. Wolfgang, June 2005
[9] Khalil, Z.; Singh, S.; Noster U.:
Results of fatigue tests: FF® lock bolts Nietverbindungen – Schlüssiges
vs. M8 bolted joints. Micrographs of joints with the new Fügekonzept, BLECH InForm, 5/2005
form-fit blind rivets and lock bolts
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