Hi desertfox,
I can confirm that the lifter will operate <16000 cycles.
I recall reading that extract but what confused me was "only need to consider the global safety of the proof of static strength". The author from the link ignored all partial safety factors etc for <16000 cycles for static...
Desertfox, I have read BS13155 and it seems to cover various types of lifters includimg lifting beams, clamps, C hooks etc. And it has also been specified by the client. Therefore, I'm confident that it applies to the main lifter fabrication too.
Rb1957, I wasn't sure what you meant by your...
The lifting beam shall be designed for a maximum of 16 000 load cycles.
Going off the below link, it seems as though, for <16000 load cycles, the requirement is basically 2x load for elastic and 3x load for ultimate. The resulting stresses are then compared against the material allowable. All...
Desertfox, many thanks for clarifying the thermal bolt load query. You have definitely helped me better understand the task within a very short space of time. So thanks once again for putting up with me :).
Yes I would appreciate it if you could look into my other thread too.
Hi Desertfox,
Slightly off-topic question, have you ever used BS13155:2020 for the assessment of lifting beams? I've added a separate post regarding this British Standard and was wondering if you had ever implemented it. Hopefully I will get some replies on that thread soon. You have been...
Hi desertfox,
Thanks for the link. For my own knowledge, wouldn't The bolt area and flange local area have an impact on the thermal induced bolt stress i.e. the stiffness of the various parts? The link uses only deltaT, thermal coefficient difference and bolts youngs modulus to calculate the...
Hi all,
I am currently working on a lifting beam which has to be designed/analysed in accordance with BS13155:2020.
In the past, I have designed lifting beams which were based upon the clients own safety factor requirements and manuals, therefore BS13155 wasnt used as such.
The following is...
Hi desertfox,
Thanks for the response.
The two flanges forming the bolt joint will be made from some carbon steel (one will be S355, other is unknown right now but a carbon steel). The bolts will most likely be grade S. So the coefficient of thermal expansion amongst the bolted joint hopefully...
Hi all,
I am currently working on a problem which involves exposing a bolted joint to an increase in temperature (delta 250 C).
In the past I have dealt with typical pretorqued bolt joints (ambient temperature) where the required pretorque was approximated by working out the actual required...
Hi Karachun,
Thanks for the feedback. I can't use enforced displacement because the displacement is unknown. And you mentioned constraining the degrees of freedoms except for the load direction. Wouldn't that still give rigid body motion in the load direction? Typically that's the case in...
Hello,
I would appreciate it if someone could give me advice regarding constraint requirements in sol101 contact body analysis. So I have a rectangular plate clamped around its edges. An unconstrained cylinder is pushing down on it using a force card. Contact bodies have been defined. Is that...
Hi desertfox.
The item is used occasionally and thus fatigue should not be of concern.
Hi rb1957.
The clamp up load has been inherited from the original design and only minor mods have been made to the design. Thus the load is a carry over from the original spec. It has been questioned but...
Hotrod10 Thanks alot for the clarification.
The previous report that I inherited had not accounted for this preload and had only stressed it to the applied hydraulic load despite the preload being far greater. And I couldn't even find any requirement for the pretorque yet the instruction manual...
Hotrod10, the preload is applied on the casing of the hydraulic cylinder. Thus the pressure gauge will show zero pressure in the presence of only the preload due to the recessed design of the piston and load transfer via surface abutment. Hope that answers your question.
canpro, it seems like the more I look into it the more confused I get. However, based upon my interpretation of hotrod10s explanation, would you agree with my last post?
